Reprap Forum - Paste Extrusion Working Group (Contents under pressure) -> http://objects.reprap.org/wiki/Paste_Extrusion https://reprap.org/forum/list.php?180 Fri, 06 Mar 2026 13:30:50 -0500 Phorum 5.2.23 https://reprap.org/forum/read.php?180,820435,820435#msg-820435 Paste extruder (no replies) https://reprap.org/forum/read.php?180,820435,820435#msg-820435
I've made a paste extruder(plunger type), in which a plunger will push the syringe to extrude. Plunger movement is controlled by a stepper motor. In that arrangement, for g-code generation I've used inside dia of syringe as the filament diameter and inside dia of needle as nozzle diameter and to calculate extruder steps per mm, I"ve used the lead of threaded rod which controls the movement of plunger.

But it had several issues like air bubbles and unable to print thick pastes.

Later I've seen this video on youtube. In which he later changed to a Auger bit mechanism and I've seen WASP LDM. already made a successful one.

I'm trying to make one of these. But in this mechanism how to calculate the steps per mm for Extruder?

Is it same as the lead of Auger bit??
What about the filament diameter in slic3r settings??
Anyone have any idea??

Thanks]]> athul Paste Extrusion Working Group Sat, 28 Apr 2018 03:37:40 -0400 https://reprap.org/forum/read.php?180,777906,777906#msg-777906 Help with Paste extruder! (1 reply) https://reprap.org/forum/read.php?180,777906,777906#msg-777906
I am building a paste extruder based on open source design. However I am having some issues with the stepper motor (NEMA17 Stepper Motors (62 oz) - Model: 1.8° - 1703HS168A ). Video link see the video : It appears that the motor is slipping (skipping?) at the coupler while trying to push the material through.

Specs: ACME 8 mm thread >>8mm-5mm coupler>> 5 mm motor shaft

I have increased the amps upto 900 mA from whatever the default was in Prusa i3 Mk2. I also set the extruder steps to M92 E 70 (steps/mm).

As you can see i am using a 50 ml syringe with about 25-30 cm tubing (internal diameter 4 mm).

Any Ideas what i can do to sort it? I am planning to increase the stepper current further and hopefully results in greater torque to push the material through.

Any help/suggestions are deeply appreciated!]]> mm13360 Paste Extrusion Working Group Thu, 13 Jul 2017 13:40:32 -0400 https://reprap.org/forum/read.php?180,757498,757498#msg-757498 "Serious" Paste-dispensing ;) (6 replies) https://reprap.org/forum/read.php?180,757498,757498#msg-757498
[attachment 92242 3D-Paste6.jpg]]]> VDX Paste Extrusion Working Group Wed, 04 Apr 2018 15:47:00 -0400 https://reprap.org/forum/read.php?180,746550,746550#msg-746550 Slurry doser for layer printing in planar chromatography (no replies) https://reprap.org/forum/read.php?180,746550,746550#msg-746550 I would like to present one of my project:
I re-purpose a 3D printer to print silica gel layer for planar chromatography.

Chromatography in two sentences is a technique allowing separation of molecules based on their interactions with a stationary phase (here silica gel) and a mobile phase (here toluene). The mobile phase flow through the stationary phase and the molecules that have more affinity with the stationary phase will flow slower than the molecules that have more affinity with the mobile phase, allowing separation.

Here is the abstract of the paper we published on the subject, PM me if you want the pdf as I don't think I can put it here:
On the basis of open-source packages, 3D printing of thin silica gel layers is demonstrated as proof-of-principle for use in planar chromatography. A slurry doser was designed to replace the plastic extruder of an open-source Prusa i3 printer. The optimal parameters for 3D printing of layers were studied, and the planar chromatographic separations on these printed layers were successfully demonstrated with a mixture of dyes. The layer printing process was fast. For printing a 0.2 mm layer on a 10 cm × 10 cm format, it took less than 5 min. It was affordable, i.e., the running costs for producing such a plate were less than 0.25 Euro and the investment costs for the modified hardware were 630 Euro. This approach demonstrated not only the potential of the 3D printing environment in planar chromatography but also opened new avenues and new perspectives for tailor-made plates, not only with regard to layer materials and their combinations (gradient plates) but also with regard to different layer shapes and patterns. As such an example, separations on a printed plane layer were compared with those obtained from a printed channeled layer. For the latter, 40 channels were printed in parallel on a 10 cm × 10 cm format for the separation of 40 samples. For producing such a channeled plate, the running costs were below 0.04 Euro and the printing process took only 2 min. All modifications of the device and software were released open-source to encourage reuse and improvements and to stimulate the users to contribute to this technology. By this proof-of-principle, another asset was demonstrated to be integrated into the Office Chromatography concept, in which all relevant steps for online miniaturized planar chromatography are performed by a single device.

For the moment, we are only printing one layer so 3D printing is a bit exaggerated, however, the auto bed levelling feature was primordial to assure an homogeneous level. Our objective is layers in the sub 50µm range.
The slurry mixture consist of 0.88 g of silica gel (particle size 5-25 µm), 0.12 g of CaSO4 and 3 g of water. Keeping the slurry under magnetic agitation before use is enough to avoid sedimentation. I must explore other recipes and especially the use of polymer binder.
I also create a software in R for GCODE creation and sending to the arduino. It was necessary to give options that make sense for a chemist, like amount of slurry per path which is set indirectly otherwise (At first, I started with OpenSCAD + Slic3r + Pronterface).
In fine, our objective is to make a small machine able to do other steps of the analytical pipeline for planar chromatography. The concept for such machine is named Office Chromatography, it was introduce in 2010 by my professor but didn't exist so far.

Here is a few pictures:
Slurry doser mounted on the prusa i3[attachment 90178 FigureS-3.JPG]
hello world[attachment 90177 Hello_world_1_R.jpg]
plate with plane layer before sample application and elution[attachment 90176 plate_69.jpg]
same plate after separation[attachment 90175 plate_69_developed_RT.jpg]
plate with channelled layers after separation[attachment 90174 plate_85_developed_RT.jpg]

The github repo: design and marlin firmware

Dimitri]]> DimitriF Paste Extrusion Working Group Wed, 08 Feb 2017 07:25:08 -0500 https://reprap.org/forum/read.php?180,733384,733384#msg-733384 Auger extruder where? (1 reply) https://reprap.org/forum/read.php?180,733384,733384#msg-733384 Im looking to build an paste extruder for other material than PLA as I'm used to.

I was looking for an Auger extruder screw, but I can't find one for the application. Where is a good place to source for a good auger extruder screw for a paste extruder?

Also what is the best paste extruder design you've seen, if you could link for inspiration.

Thank you]]> dynamitetalks Paste Extrusion Working Group Thu, 09 Mar 2017 13:37:08 -0500 https://reprap.org/forum/read.php?180,719818,719818#msg-719818 Pasta extrusion (no replies) https://reprap.org/forum/read.php?180,719818,719818#msg-719818
I recently got a request to print pasta so I looked a bit around but except for Barilla (https://www.youtube.com/watch?v=oz6D1FXwuvA) I didnt find any reprapers doing that. Im not so much worried about the paste extrusion, more about the the dough and the over all cost and time involved. Has anyone here ever tried their hands at pasta?

Cheers]]> sungod3k Paste Extrusion Working Group Sat, 05 Nov 2016 03:14:34 -0400 https://reprap.org/forum/read.php?180,643247,643247#msg-643247 High Resolution Paste Extruder Help (1 reply) https://reprap.org/forum/read.php?180,643247,643247#msg-643247
I am new to 3D printing, and am wondering about high resolution with a paste extruder. I would like to print with 100um (100 microns, or 0.1mm) resolution in the x and y axes. The needle extruding the paste does not need to be 100um thin (I would like it to be thicker), but I want to be able to have gaps between x-y layers of paste that are 100um. Basically, it would print something like a maze, with walls made of paste and pathways of 100um in width. Are there any motors that are capable of such fine movement and accuracy? Would calibration be an issue? Thank you in advance, and apologies for my lack of 3D printer terminology/experience!]]> milner Paste Extrusion Working Group Wed, 06 Apr 2016 09:13:05 -0400 https://reprap.org/forum/read.php?180,544922,544922#msg-544922 Gear pump or pneumatic valve (4 replies) https://reprap.org/forum/read.php?180,544922,544922#msg-544922
I'm interested in extruding two component resins, then I'm thinking about dosing gear pumps (annular gear pump) or pneumatic valves. Then I would appreciate your opinion about those, or is there a better alternative? I want to avoid the syringe system to get rid of the refilling issues (air).

I'm attaching photos of the pump and valve.

I can't find the pumps online, well, i found a supplier but it was intended to be used in the plastic industry at melting temperatures and high pressures (80 bars) and it costed about 1000$ per pump. In my application the resin is at room temperature and the pressure is probably less than 1 bar.

The used viscosity is usualy 10000-14000 cps, but lets assume a range of 300-50000 cps. Also the flow rate is about a 100ml / minute and I'm targeting a precision control of about 0.007ml. Then do you have any suggestion or any advice?

Thank you,
S. Kheireddine]]> mindoverflow Paste Extrusion Working Group Mon, 17 Aug 2015 06:55:15 -0400 https://reprap.org/forum/read.php?180,540868,540868#msg-540868 Discov3ry Paste extruder with Reprap ? (no replies) https://reprap.org/forum/read.php?180,540868,540868#msg-540868
I am just wandering if anybody has tried the Discov3ry Paste extruder with Reprap printer?

[www.structur3d.io]

I am thinking of ordering one but would like to hear any reviews.

Or maybe you could recommend me better alternatives for reprap to print with acrylyc adhessive 6000mpas.

Many thanks.
Best regards,
Taisiya]]> Taisiya Paste Extrusion Working Group Sun, 02 Aug 2015 10:33:03 -0400 https://reprap.org/forum/read.php?180,530001,530001#msg-530001 Silicone printing & spraying on 4 axis printer (5 replies) https://reprap.org/forum/read.php?180,530001,530001#msg-530001
I built a silicone printer which can spray thin layers of silicone onto a permeable form, stretch it by inflation, 3D scan the subsequent balloon and then 3D printing silicone over the surface of the inflated structure.
I've made a video of the process here :

https://www.youtube.com/watch?v=Qmuf_6h7Kl8




All the geometry is calculated in by a script i wrote in Grasshopper3d, which also produces my GCode. I then wrote a printer control software script in Processing. This allows me to control multiple micro controllers at once, including a RAMPS for coordinated movements.

Rather than using a volumetric pump for the silicone, i use a high viscosity spool valve, with material pressured from behind (at about 80psi) - my silicone has a super high viscosity.

I can control the shape of the inflation on the balloon a little too :




Hope it's of interest to you...

There's a little more info at fergalcoulter.eu
]]> Cowfingers Paste Extrusion Working Group Wed, 08 Jul 2015 15:57:43 -0400 https://reprap.org/forum/read.php?180,529124,529124#msg-529124 3.5 liter syringe type paste extruder (no replies) https://reprap.org/forum/read.php?180,529124,529124#msg-529124
First test]]> the_digital_dentist Paste Extrusion Working Group Sat, 04 Jul 2015 16:56:02 -0400 https://reprap.org/forum/read.php?180,512277,512277#msg-512277 Calculating motor torque required to operate a syringe type paste exrtruder (3 replies) https://reprap.org/forum/read.php?180,512277,512277#msg-512277 the_digital_dentist Paste Extrusion Working Group Sun, 10 Jun 2018 02:27:58 -0400 https://reprap.org/forum/read.php?180,430270,430270#msg-430270 Dental Polymer (1 reply) https://reprap.org/forum/read.php?180,430270,430270#msg-430270 Graybeard Paste Extrusion Working Group Sun, 26 Apr 2015 13:41:23 -0400 https://reprap.org/forum/read.php?180,398903,398903#msg-398903 Delta Clay Printer Marlin Upload issue - help please (no replies) https://reprap.org/forum/read.php?180,398903,398903#msg-398903 I am helping someone with a (clay) Delta Type printer build as per Jonathan Keep's instructions. We have had a problem uploading the Marlin firmware and a message 'sdFile has not been declared' has been noted. I have searched for other posts on forums and can't find anything relating to this. Any tips/ideas gratefully received. Thanks, Paul.]]> mcallister3d Paste Extrusion Working Group Mon, 25 Aug 2014 10:52:08 -0400 https://reprap.org/forum/read.php?180,363747,363747#msg-363747 Chocolate Extruder (:D (4 replies) https://reprap.org/forum/read.php?180,363747,363747#msg-363747 Forum Link

Hopefully i get the whole new prototypes in a few days, they will be precision cnc machined from FDA grade materials and nearly no leakage. As you can see in my videos, i already made good results with a small water pump.

Greetings from Austria,

Nick :)-D]]> Kolbi Paste Extrusion Working Group Mon, 02 May 2016 15:03:13 -0400 https://reprap.org/forum/read.php?180,329176,329176#msg-329176 Article on Paste Extrusion in RepRap Magazine (7 replies) https://reprap.org/forum/read.php?180,329176,329176#msg-329176
I've written an article for the new RepRap Magazine that gives an elaborate overview of paste extruders and concepts, summarizing much of the experiments me and others have done over the years. Hope you enjoy reading it.
If you don't want to read all those pages, so far there are 3 principles that are useful (ore hopeful) to use for paste extrusion. Direct Air Pressure & Stepper Driven Syringe Pump extruders are fairly established and most used but have their serious drawbacks both in operation and in mechanical construction. The most promising candidate to solve those issues (and I've done a fair amount of testing on that) is the Moineau Pump. What's needed now are some great minds and hands to improve those extruders based on that principle :)
I will write a follow up post on unfoldfab.blogspot.com soon detailing more of our tests with a modified Moineau extruder based on Tomi Salo's design and what needs to be improved in order to get it working.]]> unfold Paste Extrusion Working Group Wed, 15 Oct 2014 09:39:01 -0400 https://reprap.org/forum/read.php?180,317852,317852#msg-317852 wiring a linear stepper motor and melzi (3 replies) https://reprap.org/forum/read.php?180,317852,317852#msg-317852
I have got a linear stepper motor for Paste Extrusion. It's the same one used on the chocedge.

Here is a link.

[www.machineto.com]

I can't get it weird and working properly on a Melzi Controller Board. I have a feeling I am wiring it wrongly.

Can someone help me out?

Here is information on the Melzi board.
[reprap.org]]]> mekastudios Paste Extrusion Working Group Mon, 03 Mar 2014 09:39:56 -0500 https://reprap.org/forum/read.php?180,300621,300621#msg-300621 ChocEdge From Sanguinololu to Melzi - will it work? (no replies) https://reprap.org/forum/read.php?180,300621,300621#msg-300621
I have a ChocEdge that has a fried Sanguinololu board. I do not just want to replace it with a new Sanguinololu, those have been giving me problems and I am a bit more familiar with the Melzi boards. I would really like to change the electronics to a Melzi board so that I can add on a heated bed and an LCD screen. My question is basically will this work?

1. What changes would I have to make for the firmware? For example, the chocedge does not need a temperature sensor for the extruder, how do I make that change?
2. What power supply/input would I need? - What does this depend on, the Melzi board or the motors?
3. I plan to use the Panelolu2 LCD for Melzi, anyone have any thoughts on this?

I’m not sure about the exact specs of the ChocEdge to begin with - many questions remain, is it a custom marlin firmware? what motors does it use?, power consumption of the motors and solenoid to allow for controlled extrusion? If anyone has any views there, that would be gold!

New research:
All 3 axis on the ChocEdge run: [www.aliexpress.com]
The dispenser is controlled by: [www.stepping-motor.cn]

If someone is willing to help me with this build, I would be eternally grateful!

Shafiq
Mēkā
everyoneacreator.com]]> mekastudios Paste Extrusion Working Group Fri, 24 Jan 2014 22:13:40 -0500 https://reprap.org/forum/read.php?180,289948,289948#msg-289948 Ghetto all metal hotend, nozzles sizes start at 0.15mm (no replies) https://reprap.org/forum/read.php?180,289948,289948#msg-289948 Sorry for the *really* bad design pic, i usually draw everything on paper and not on computer and didn't feel like making a 3D model for this.

So i've been thinking of making a ghetto style hot end.

Minimal BOM is:
1x40W Heater cartridge
1xThermistor
3mm ID/5mm OD SS Pipe ~15-20cm
5xM5 nut
1xM6 extension nut
1xM6 bolt/piece of threaded rod
1xM6 nut (cartridge mount)
~10xM5 washer
~10xM5 fender washer
1x40mm fan for heatsink cooling
1xSmall piece of fiberglass insulation (optional/prototyping, not certain yet of requirement)
1xSmall piece of kapton tape (optional)
1xPrinted fan duct & mount (after first prototype will know exact dimension and model it)

Tools required:
MIG/MAG Welder
Drill/Bench drill
Dremel
Wrenches
Angle grinder etc.
Listed in picture

Cost of making this hotend, first piece (larger quantities minimum purchase):
SS Pipe 1meter: ~5€ max
Heater cartridge: 2-5€ (single piece)
Nuts+washers+bolts: 2€ MAX
40mm fan: 1€? 2€?
Fiberglass insulation: If you don't got, don't bother purchasing, tho you can get from various sources small pieces for few euros with tape, automotive exhaust header style was my thinking
Kapton tape: To secure wiring etc. you can also use aluminium tape, SS zip tie or whatever
Thermistor: 0.5€?

Shipping costs etc. will be the greater cost, and just making a single one raises the cost. So parts are best acquired as part of other orders etc.

My cost for the initial one will be something like:
SS Pipe x2 under 10€
10pack of heater cartridges 15€
pack of thermistors ~5€
Nuts & Bolts: 5€
But those will be enough to make 10x hot ends with single heater cartride (i'd like 2 with lower voltage for more even heat distribution if that matters at all) and a bunch of nozzles
Total cost is then: 35€ + probably 5hrs of shop time for the pack of 10
+ micro drill bits i had to order but obviously i should have these in any case

I'm thinking the first one will take me 1-2hrs while fiddling around with exact dimensions etc.
Further units will take like 30mins to make. Hardest to make is the nozzles due to so much drilling and precise work. The slowest piece to do is the threading on the SS pipe.
To build this quicker one could weld in most of things, if non removable pot then only thread required is ~20mm on top or less.

Any obvious issues?
I designed it with that long nozzle piece so i can drill it out for larger diameter - Does it make sense to have a larger melting pot, or should the melting area be kept small and neat? Perhaps even going below filament diameter BEFORE the actual nozzle?

Benefits of this for me at least is that i can make 0.15mm nozzle
Another benefit is that i can design the preheat distance for VERY fast printing, and the mount being with nuts i can secure it tightly on the mounting piece.
One the first one for testing i can't obviously have the extra chamfer on top end so i can dissassemble it almost fully still if i need to make the heatsink taller.
Also this is trivial (and designed for) dual heater cartridge so reaching polycarbonate temps on high speed is not the very least of an issue, then again 40W properly mounted is strong enough to make it non issue to begin with.
Further, you can remove either the full pot OR just the nozzle.

I'm also hoping that after drilling out the hole for heater cartridge it's a very snug fit, so no grub screw required.

Drawback: Cold pressed mild steel + SS is heavy, but on the plus side, the heat capacity of those is LARGE if you are targeting ultra high speed.
Ofc, not everyone can make these at home since welding is required and preferrably a proper angle grinder which i would not recommend anyone to use at home due to fire hazard.

Further development could be doing the heatsink from aluminium if i acquire (or better yet: MAKE) a lathe and find properly cheap aluminium stock :P

What is the cheapest all metal hot end on the market right now?]]> PulsedMedia Paste Extrusion Working Group Sun, 05 Jan 2014 23:39:37 -0500 https://reprap.org/forum/read.php?180,248378,248378#msg-248378 Peristaltic pump with ceramic? (4 replies) https://reprap.org/forum/read.php?180,248378,248378#msg-248378 jamesshuang Paste Extrusion Working Group Tue, 01 Apr 2014 11:12:23 -0400 https://reprap.org/forum/read.php?180,242360,242360#msg-242360 PLYUMP peristaltic extruder (7 replies) https://reprap.org/forum/read.php?180,242360,242360#msg-242360 For the last months i have been playing/designing a peristaltic extruder for my printer.
Here you can see some demos:
http://www.youtube.com/watch?v=5r0t-Qg7vVA
http://www.youtube.com/watch?v=L4zxIf46S3k
http://www.youtube.com/watch?v=9pFjEbcMk1Q

I have start documenting everything here:
http://lyulyulyulyu.tumblr.com/post/60091436004/plyump-intro-1-of-5

I would thank any opinions, comments, suggestions or feedback.
Thanks a lot!]]> LasVegasOle Paste Extrusion Working Group Sat, 14 Sep 2013 10:16:30 -0400 https://reprap.org/forum/read.php?180,237695,237695#msg-237695 Printing Ferrites (2 replies) https://reprap.org/forum/read.php?180,237695,237695#msg-237695
Recently Hackaday featured a 3D printed stepper motor. Of course, while neat, it didn't have many practical applications, because really the only things that were 3D printed were structural parts. It still required normal electronics, and permanent magnets housed in the plastic rotor. However, someone in the comments mentioned that steppers with permanent magnet cores often used ferrite.

Ferrites are magnetic ceramics whose primary component is iron(III) oxide. Iron(III) oxide is pretty cheap. You could make dozens of steppers with five dollars worth of iron(III) oxide. The problem is the binder. Most commercial ferrites use strontium carbonite, barium carbonate, or cobalt. I don't know much about magnets, but I'm assuming there's a reason all those binders are metallic. That's why I'm posting here. I'm hoping there's some way to print iron(III) oxide containing cements, ceramics, or even plastics that can still be permanently magnetized.

The reason I want to be able to print ferrite should be pretty obvious. As far as I can tell, stepper motors are a major component of the price of most repraps. If people with a 3D printer could print the permanent magnet rotor, wind the copper themselves, and print a plastic shell, I imagine the price would come down quite a bit.

edit: Plus, if we could 3D print stepper motors, we could use motors with the optimum capabilities for a given design, rather than shaping a design to fit the available motors.]]> terribleperson Paste Extrusion Working Group Mon, 02 Mar 2015 11:22:53 -0500 https://reprap.org/forum/read.php?180,234396,234396#msg-234396 Gallium Indium Alloy and slicer problems (no replies) https://reprap.org/forum/read.php?180,234396,234396#msg-234396
I'm currently testing a simple syringe extruder loaded with Gallium Indium alloy. It should be perfect albeit slightly expensive for printing 3d circuitry. I've run into a problem with slic3r, I'm trying to set a crazy extrusion multiplier of 0.041 for my syringe extruder, it's on a multi-material mendel so I can't set this in firmware!

Slic3r is completely ignoring that setting. I've tried some wildly different values and had a look in the Gcode and it hasn't affected the E values at all!

Does anyone know if this is a bug or deliberate feature in slic3r?

Also does anyone have any ideas how I can generate multiple extruder gcode with one extruder setup very differently to the other?

Cheers for any help,

Pete]]> PeteBlackerThe3rd Paste Extrusion Working Group Sat, 10 Aug 2013 05:08:58 -0400 https://reprap.org/forum/read.php?180,202331,202331#msg-202331 Silicone extruder (2 replies) https://reprap.org/forum/read.php?180,202331,202331#msg-202331
[attachment 14227 extruderPLAN.jpg]
[attachment 14228 plunger1.jpg]
[attachment 14229 plunger2.jpg]

We want the step motor to be controlled directly from the mother board (I switched polarity so the threaded rod turns correct direction). Is there a female coupling that will connect the motor power from the motherboard to the Nema 17 that powers the extruder (see pic)? They are identical 6 wire ports with 4 wires attached, 26AWG.

[attachment 14226 FemaleCoupling.jpg]

Can anyone recommend a supplier?

Thanks,
Jo]]> joqnelson Paste Extrusion Working Group Thu, 25 Apr 2013 16:44:38 -0400 https://reprap.org/forum/read.php?180,185249,185249#msg-185249 Paste vs Gel (2 replies) https://reprap.org/forum/read.php?180,185249,185249#msg-185249
[en.wikipedia.org]

[en.wikipedia.org]

What are the differentiating properties of each? Both seem to be colloids, but gels seem to have better adhesion properties.
When would it be better to use one vs the other?
Is there anybody working on gel extrusion?]]> sanman Paste Extrusion Working Group Sun, 17 Feb 2013 13:17:44 -0500 https://reprap.org/forum/read.php?180,132341,132341#msg-132341 UV-cured Bondo for 3d printing? (1 reply) https://reprap.org/forum/read.php?180,132341,132341#msg-132341
Anyone try this or know of trials or want to try?

Quinxy]]> quinxy Paste Extrusion Working Group Sat, 01 Dec 2012 09:44:45 -0500 https://reprap.org/forum/read.php?180,127592,127592#msg-127592 Universal Paste Extruder for RepRap (8 replies) https://reprap.org/forum/read.php?180,127592,127592#msg-127592 Universal paste extruder

It can be used for all sorts of things, Chocolate, Ceramic, silicone, solder paste, food etc.



All the files are up on thingiverse -

And a build video is here - if you want to build one.

Along with lots of other videos on my YouTube channel

Rich.
]]> richrap Paste Extrusion Working Group Thu, 21 Mar 2013 05:39:34 -0400 https://reprap.org/forum/read.php?180,122654,122654#msg-122654 Wiring up a Paste Extrusion Solenoid (6 replies) https://reprap.org/forum/read.php?180,122654,122654#msg-122654 Sorry for cross posting this to the BFB forum - this just seems like a more active place...

I've been following Unfolds design for the Claystruder, to connect to our BFB3000 -I'm working to try extrude UV cure Silicone...
Alas, I'm just having trouble with the wiring of the system.

We bought a DC6012 3/2 valve from Burkert, but I'm not entirely sure which of the wiring that feed the normal ABS filament extruder steppers I should connect up to the solenoid.

Also, I'm not too sure where to insert the differing resistors to tell the controller board the extruder ID - I've measured everything I can from my removed hot end extruder, but haven't found anything corresponding.

Finally, do I still need to keep a hot-end extruder attached somewhere, or can I remove it? (I got the impression from here that Unfold kept his attached initially)

I've been reading as much as I can on this, but unfortunately Unfolds blog is missing a lot of pictures. I'm going to ask him directly too, but I fear he may be pretty busy!



Thanks to anyone who responds!

fergal]]> Cowfingers Paste Extrusion Working Group Wed, 04 Jul 2012 08:26:45 -0400 https://reprap.org/forum/read.php?180,117850,117850#msg-117850 Concrete (1 reply) https://reprap.org/forum/read.php?180,117850,117850#msg-117850 TheGremlin Paste Extrusion Working Group Wed, 08 Feb 2012 17:45:07 -0500 https://reprap.org/forum/read.php?180,112397,112397#msg-112397 Moineau stepper extruder (11 replies) https://reprap.org/forum/read.php?180,112397,112397#msg-112397 Moineau pump principle. In theory that design should work well as an extruder, as it has completely non-pulsating output and can pump pretty much anything. Running it with a stepper motor should allow controlling the extrusion just like in a hot plastic extrusion head.

Here's what I have so far: Exploded view. From the bottom, there is a conical nozzle, then the pump stator body and on the top, the pump inlet body, with NEMA17 mount and an inlet pipe. The stepper motor drives the pump rotor with a spider coupling, modified into a long shaft from this thing.

I have already printed the pictured parts and after I fix the designs of the motor couplings and get them printed, I'll be running some actual tests.

I'm not sure if PLA printed stator and rotor will seal well enough to reliably pump fluids. Commercial designs seem to use a molded elastomeric stator. Does anyone have experience with these things?

Also, what sort of paste would be a good starting point for trying this out? I'm thinking of paste made from water and wheat flour. That at least seems to be easy to clean up and non-toxic.]]> ttsalo Paste Extrusion Working Group Mon, 13 Jan 2014 10:00:26 -0500