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http://reprap.org/wiki/Smartrap_mini A new printer near first release, still in development ... Its main goals are ease/speed of assembly, low cost and modularity (being an easy basement for new designs).
Re: Is Nema17 1.2A too weak for 3d printing? - 8 years ago
This motor is being sold by someone in the area i've noticed it on a local sale website so I was wondering if it's worth it. My reprap is as simple as it gets, belt everywhere (Z included - that should have some gearing or 0.9 at least) and linear rods, so nothing spectacular or fancy.by realthor - CoreXY Machines
Is Nema17 1.2A too weak for 3d printing? - 8 years ago
What range of amperage should we look for when buying stepper motors? Nema 17 specifically, they seem to be the norm with 3d printers these days. Thanks.by realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotelkcl Quoterealthor Nono, i've kind of given up that idea -I understood about the NO shortcomings and the exposed contacts risks- ... was focusing on switchless homing by reducing the motor current so it hits the wall, skipping steps as it thinks it's still moving, until enough coverage has been traversed to be sure it's there at the end of the rods, then coming back and counting the steps onby realthor - CoreXY Machines
Re: Feedback needed for a Smartrapcore-compatible X Carriage (with symmetric/balanced tensioning mechanism) design - 8 years ago
Design uploaded to thingiverse: Also included the 30mm @Smartrapcore ALU module.by realthor - Smart_Rap
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Nono, i've kind of given up that idea -I understood about the NO shortcomings and the exposed contacts risks- ... was focusing on switchless homing by reducing the motor current so it hits the wall, skipping steps as it thinks it's still moving, until enough coverage has been traversed to be sure it's there at the end of the rods, then coming back and counting the steps on its way.by realthor - CoreXY Machines
Re: Feedback needed for a Smartrapcore-compatible X Carriage (with symmetric/balanced tensioning mechanism) design - 8 years ago
Done. Actually I have cleaned a lot of the previous inconsistencies, + re-gained the 4th bearing. The only worry I have is that it can be too thin at the bearing block wall to hold them properly when snapped in: The belt grippers are perfectly symmetrical so it will be easy for me to modify it to requested widths. I will print one of them in the same piece with the carriage body as I only needby realthor - Smart_Rap
Re: Feedback needed for a Smartrapcore-compatible X Carriage (with symmetric/balanced tensioning mechanism) design - 8 years ago
Frankly the smaller the bearings on the Y axis the better actually ... so I would only go from 608s downwards. You say you use 608s which means that the belts are not parallel going into the inner slot (which is tailored for F604ZZ). You should actually print my current design (http://www.thingiverse.com/thing:1505842) because that one is 608 size on the outside and F604ZZ on the inside slots. Iby realthor - Smart_Rap
Re: Feedback needed for a Smartrapcore-compatible X Carriage (with symmetric/balanced tensioning mechanism) design - 8 years ago
@DjDemonD: your request to have symmetric (modular) X Carriage is a tough one. I have sacrificed one bearing in order to be able to squeeze in the slider/tensioner. Having a similar approach in the other side of the carriage is proving more challenging that I have thought... I'll come back if I have a good idea (for now the solution would be to raise up both belts but that would screw up my wholby realthor - Smart_Rap
Re: Why the bearings pulley-sleeves? - 8 years ago
QuoteDjDemonD That's good, the black one I printed that I posted as a make on thingiverse, the belts can be directly fixed rather than going around the clips so that works. I've designed a flex3drive mount to fit onto this carriage I'll post it if it works. Also I move the top hole for the extruder mount downwards (see the one I made) as where you have it now does not allow any adjustment of theby realthor - Smart_Rap
Re: Is there a way to break STL in individual parts' files? - 8 years ago
Quotedanilius Cura has a function to do that, right-click on an object and select "Split object into parts". Or use Blender, go into edit mode and press "a" to select everything (usually it is selected already) and then press "p" and select "by loose parts". I actually need to save all those parts in their own STL files in one go. Cura doesn't provide that function, when you save the split objecby realthor - Slic3r
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotedc42 I tried this once on my delta printer. I use a Z probe to autocalibrate after homing, so the homing only needed to be accurate to about half a millimetre. It worked, but it was still noisy when driving the carriages against the stops, and of course homing took the same length of time as the worst-case even if the printer was almost at the home position already. My conclusion was that itby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
noted.by realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Boards with digital current control: Rambo Azteeg X3 Mini Duet (most likely) Boards with manual current control: RAMPS Brainwave Pro Azteeg X5 (optional) (http://matterhackers.dozuki.com/Guide/Tuning+Motor+Current/37) Personal opinion: for static cables/switches wires breaking is very unlikely + with reduced current during homing (the way I explained above) even so thby realthor - CoreXY Machines
Re: Is there a way to break STL in individual parts' files? - 8 years ago
Ok, for the OpenSource crowd (me included), here's what I've found by raising a Feature Request to Slic3r There is a script called split_stl.pl that does what I need ("splits an STL model into multiple STL files, one per piece") http://manpages.ubuntu.com/manpages/wily/man1/split_stl.1.html This script is included in slic4r for linux and for windows one has to compile slic3r from sources. Eby realthor - Slic3r
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions - 8 years ago
I have addressed over the last weeks (as time permitted), the shortcomings of the design that I was not happy about. For once, I have full adjustability in all components that deal with the squareness of the XY gantry: So, the motor can move left-right a bit to accommodate the position of the Y Carriage, the position of which is dependent on the Y Rods as they are being adjusted to square thby realthor - CoreXY Machines
Re: Why the bearings pulley-sleeves? - 8 years ago
I have adjustability through the hotends mount itself and my newest design (not yet posted, i think), can even take it on/off easily by just unscrewing a couple threads on the bolts. But I have so many things to design/redesign constantly it's overwhelmingby realthor - Smart_Rap
Re: Why the bearings pulley-sleeves? - 8 years ago
That's easy enough. My original (http://www.thingiverse.com/thing:1369402) has the 608 spacing between belts. They are actually the same thing in my design, just that the fixed one I export in the STL and it gets glued by the repairing serviceby realthor - Smart_Rap
Re: Why the bearings pulley-sleeves? - 8 years ago
If you can spare some time to make a napkin sketch I might try. Didn't quite get what you're asking. Post a picture of the current setup/ video ... and adnotate it or somethingby realthor - Smart_Rap
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
As with most things a software solution is the best. Not only that software reducing the current while homing would prevent any damage if something was broken, but a software solution alone can replace the X and Y endstops alone. It would work like this: - current is reduced by such amount that when the Y carriages hit the end points they "keep going", skipping steps easily (just as a torque adjby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quoteos3dp I somehow had an old page. I posted but didn't see ALL the other posts before. -os3dp Funny, cause I got the mail with your post yet I don't see it here...by realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotethe_digital_dentist ABL = auto bed leveling yeah... it didn't click.by realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
I am not after fights here MKSA, the first one was a genuine question. Also the second, what is ABL? See, I accept people have different views and I really wanted NO to be better, because that's why I was after. Some people here in the forums have a hard time to understand that others can be very different and tend to put everybody in the same pot. I spend a lot of time out of my home/town/countrby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotedc42 Building and testing is necessary and all very well, but the best designs also consider "what will be the effect if XXX happens?". For example: - What will happen if there is a bad crimp connection in the endstop switch circuit? I'm not very technical but with normal microswitches you still have to do the wiring right? That would be the same situation. - If you use exposed contacts inby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
This is a NO circuit. A Contact-Tabs pair on each Y Rods Clamp as in this picture. Bearing touches, contact made => endstop triggered. Same for the other Y on this side. Either of them touches first (hopefully both at the same time but pretty unlikely) the endstop triggers. If this was done in series then both should touch to close the loop, which is not that bad either as the motors will puby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotegrat Also, if you wire in series with NO -> NO -> NO -> NO, then closing any particular switch will not complete your circuit. Conversely, using all NC, any switch opening will break the circuit, causing the entire circuit to go "open". You're completely right. I mixed them up in my previous post. Actually I would build them in parallel for the NO and in series for NC, exactly asby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
QuoteMKSA Different thing here. Talking about ENDSTOPs, which are BETTER to be NO. Why is that? It is really the first time I hear that. Crashes can happen in XY as well... QuoteMKSA If you want an other mean to determine the Z 0 with for example a probe on the print head to provide ABL, indeed but you better make sure not to sacrifice reliability.. ABL=? QuoteMKSA As a matter of fact this hby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
No objection really, maybe a bit more complexity and the fact that the simple low tech devices aren't that good (mechanical microswitches for ex). It's no secret that I like the low-tech approach of the instant direct-contact of the nozzle2bed approach for Z. So I am in pursuit of similar versions of X and Y. Y is quite simple, like I said before, bearing closes the circuit when it touches twoby realthor - CoreXY Machines
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Quotedc42 2. If a connection goes bad, NO endstops will fail to trigger, so during homing the carriage or bed will not stop at the end, possibly causing damage in some designs unless the motor current is reduced during homing. With static cables and connectors it is quite unlikely for that to happen. And with 3D printers the motors will skip steps before damaging anything in the XY plane (not Z,by realthor - CoreXY Machines
Re: Is there a way to break STL in individual parts' files? - 8 years ago
Wow, I just managed to do it by mistake ... In Meshmixer: 1) import STL, 2) go to straight to Print (lowest Icon on the Left Ribbon), 3) then select the "Separate Shells" button at about the middle of the left stack. 4) Once Meshmixer splits the whole file in individual meshes Select the first one then Scroll down to the last one and Shift+Click that one to have all meshes selected and Hit "by realthor - Slic3r
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago
Do you guys see a major problem/concern with Normally Open circuits? I think I remember seeing a circuit that makes a NO circuit a NC one by adding some electronics wizardry (nothing too complicated, but for me everything electronics is complicated). Regarding NO: - what about running wires in series through the 4 Y receiver parts so that when the bearing comes and touches it, the current closesby realthor - CoreXY Machines