BTW what are the advantages of glass filled nylon 12? Is it just filler material to make it cheaper and more recyclable? I guess it also improves strength if you look at the datasheet and that it might hold up better to temperature. But does it sinter better or worse for our purposes?by Dejay - Powder Printing and Selective Laser Sintering
Oh interesting. Yeah quartz-halogen heating lamps definitely seem the way to go. 24€ for a 1200W heater! Aluminium seems to be a good reflector for IR. Gold is the best one - I guess that is why they use it to coat FIR laser mirrors. You could use a polished aluminium sheet to form an effective reflector for the print surface. If you could calculate the right shape for the reflector you could diby Dejay - Powder Printing and Selective Laser Sintering
QuoteLukas HoppeI was indeed planning to use a visible laser, in fact I have already one sitting on the desk in front of me. Therefore the glass should not be too much of an obstacle as the laser remains in a constant 90 degree angle to the sheet of glass. And as the laser diode I am intending to use delivers as much as 2 watts, there is plenty of power. What model laser diode did you get? I resby Dejay - Powder Printing and Selective Laser Sintering
Thanks for explaining, I think I get it now. The focused image has a certain size. Makes total sense I guess to shrink this focus image further down at a certain distance you'd need additional lenses. I've seen that you can reduce the "ellipse" in one direction with two prisms like this one. I've looked around and read a bit from the laserpointerforums etc. Some crazy youtube video's out there!by Dejay - Powder Printing and Selective Laser Sintering
QuoteLukas Hoppejust wanted to add the OpenSLS project to the list Of course OpenSLS! What an omission That's why I needed a list. And the CandyFab with hot air melting sugar is quite interesting too. But the Blueprinter is very impressive for sure! How does the thermal print head work? It looks like a copier or something. I wonder what powder / material they use? It seems they have filed a paby Dejay - Powder Printing and Selective Laser Sintering
I've been reading up on the possibility of SLS selective laser sintering DIY 3D printers the last days. I just wanted to write down what I've found out so far plus a few thoughts and a list of what project there are out there (which will likely be outdated very quickly!). If you know any other projects please let me know. From what I've read a SLS printer with a gantry and a 2.3W laser diode forby Dejay - Powder Printing and Selective Laser Sintering
Thanks again for your valuable insight! But what is the problem with focusing a diode laser to a spot? Is it just the changing distance of a galvo? I've seen those beam shapes (e.g. here) but can't you just focus the beam with a lens to a spot on e.g. 500mm? I'm just trying to understand where the problem lies. Are those diodes with fiber optics just generally better and "prefocused" or does tby Dejay - Powder Printing and Selective Laser Sintering
QuoteJoshua DickersonSo far we haven't been able to notice a difference, but we also are just barely getting the surface heater unit up and running. We were delayed by applying to a bunch of startup accelerators. When we start seeing the results from the upgrade, we'll followup with you and let you know. Ah the damn paperwork I'd bet controlling the surface temperature precisely and tuning theby Dejay - Powder Printing and Selective Laser Sintering
QuoteLegion 2.3Überhänge lassen sich mit dem SLA/DLP-Verfahren doch prinzipiell besser drucken als mit FDM, oder? Besonders, wenn man Top-Down arbeitet und das Druckteil quasi garkeiner Kraft ausgesetzt wird (Im Gegensatz zum Bottom-Up-Verfahren, wo sich das Druckteil am Boden festsaugt), kann man theoretisch Überhänge mit 89° Neigung drucken. Da müssten nur noch wirklich frei schwebende Flächenby Dejay - Allgemeines
Just to keep littering comments in all the threads I'm reading I had this idea: To deal with different focus points maybe you could move the mirror while rotating it? So while you are rotating the mirror also moves closer to the laser in order to reduce the length of the beam. Of course the mirrors would have to be larger. Not sure if it can actually work, but maybe it's as simple as attacking thby Dejay - Controllers
Quotenothing11aber warum eine Laser nehmen , nimm doch einen DLP-Beamer und du kannst immer den ganzen Layer belichten, so werd ich das versuchen. Bin gerade dabei mir so ein DLP-Drucker zu bauen. Bin aber nocht nicht ganz wo weit nur das Grundgestell steht und ein paar andere sachen sind bis jetzt gebaut. Oops sorry. Thema des Threads ist in der Tat SLA und nicht SLS SLA interessiert mich auchby Dejay - Allgemeines
Quotenothing11 Zum steuern von Galvo gibt es doch schon ein Board Lasershark Danke! Wie gesagt, ich bin ein Elektronik-noob und stöbere nur. Der Lasershark hat einen USB anschluss. Was schön wäre ist eine integrierte Lösung die man direkt mit nem reprap typischen controller board programmieren kann. Also direkt laser diode und galvo motoren anschließen und fertig ohne Kabelsalat und Elektronikfaby Dejay - Allgemeines
QuoteLegion 2.3Dagegen verunsichert mich allerdings sehr die Tatsache, dass es bis jetzt (korrigiert mich, wenn ich falsch liege) noch keine Hobby-SLS-Geräte <10.000 € AUF DEM MARKT gibt. Es sind eine Hand voll Geräte angekündigt aber man weiß auch nie, ob die es tatsächlich auf dem Markt schaffen. Die Ergebnisse von dem Sintratec SLS sehen echt vielversprechend aus. Für DIY das Schwierigsteby Dejay - Allgemeines
@VDX thank you! I've read a bit more and came to the same conclusion (mostly thanks to your posts). I guess the best way for a DIY SLS printer project is to just go with something like a 2.3W laser 445nm and dark Nylon PA12 like Sintratec does. You could always upgrade later. Honestly I see no real reason why for this limited use case SLS should be more expensive than a FDM printer. You need aby Dejay - Powder Printing and Selective Laser Sintering
Yeah sorry for some reason I didn't read the whole thread properly before replying. Printing overhangs and just adding a pause to let it cool might work even better than moving the build plate around all the time. My guess would be as soon as you even vary the orientation of inner and outer layers a little bit you will get far stronger parts. Or even just a wavy print like your picture should beby Dejay - Developers
Nice project! I'd love to build my own SLS printer. About the melting vs sintering and print quality, isn't sintering better to avoid "globs" of molten droplets? I've read about this here. Does the print need to adhere to the print bed or can they just start in the middle of the powder? I'm asking because I would think that not having to worry about use blue tape or print surface adherence etcby Dejay - Powder Printing and Selective Laser Sintering
6-axis 3D Printer from 2013 After seeing this 5 axis 3D printing video here the ideal 5 axis printer would probably be a rotating print bed. That way you can disobey gravity, even though it's the law Maybe a delta with a 2D rotating print bed? Adhesion would have to be really good. Maybe a print bed with something like an inverted delta that can 2D rotate and lift? (3 linear actuators, one ceby Dejay - Developers
Very nice project! I would love to build an SLS machine myself, but I have yet to finish my Kossel Mini printer and just read a little. I like the design, thanks for sharing your progress on instructables! Separating electronics and gantry from the hot and messy powder bin seems like a good idea. But does the laser just pass through the glass? I guess this also depends on the wavelength. Is thaby Dejay - Powder Printing and Selective Laser Sintering
This is all a bit confusing. So infrared lies between 700nm to 1000nm. Above 1000nm is microwave. Yet on the wikipedia page it says "people can see infrared up to at least 1050 nm in experiments". So is a 975nm laser diode the ideal then for heating even white / clear plastic? Isn't that "deep infrared"? EDIT: Oh wait lol I just realized that infrared goes up to 1mm, or 1000um, or 1000000nm. Soby Dejay - Powder Printing and Selective Laser Sintering
The photo's look pretty awesome! Are those printed with sand on your own machine?by Dejay - Powder Printing and Selective Laser Sintering
Î wouldn't worry about firmware precision problems too much atm. There is also repetier, another firmware for delta's that uses integer math. But that has the problem with scaling already with large delta bots. You could always divide the scale by 10 of course. Those firmwares are for the 8 bit arduino boards. Then there is smoothieboard which is 32bit and THEN there is beaglebone black, a compleby Dejay - Delta Machines
About the video: Cool you're actually doing it! Nice BTW talking about motor speeds is a bit confusing because these are step motors and you can address them in relative steps, not motor speed. For example 200 steps per rotation with e.g. 1/16th micro steps etc. But the firmware DOES take acceleration into account to avoid abrupt halts that would lead to jerkiness etc. Generally the firmware sby Dejay - Delta Machines
You can find info on the kinematic math for delta bots here: Here is a wxMaxima worksheet (not from me, just adapted) to play around with. You can see the formula there too. The basic inverse formula is: A = (x-xa)^2 + (y-ya)^2 + (ta+oa)^2 - rod^2 B = (x-xb)^2 + (y-yb)^2 + (tb+ob)^2 - rod^2 C = (x-xc)^2 + (y-yc)^2 + (tc+oc)^2 - rod^2 A, B, C is the coordinates of the axis. xa/ya etc is thby Dejay - Delta Machines
QuotetobbenWhat you're desicribing sounds similar to the SkyDelta without the springs? Ah right! The sky delta! Well I don't really know if and how well this idea would work without springs. I'm just spit balling. I guess the more horizontal the strings are the better the x/y acceleration but also more vertical springiness and elasticity. Might have to use stainless steel strings. But X/Y moveby Dejay - Delta Machines
I guess a simple implementation would be a delta printer suspended on strings. If you'd have 3 pairs of parallel strings it should work just like delta arms. Just the movement speed / acceleration / deceleration would be limited by the force gravity exerts. Moving sideways this might be quite slow to avoid backlash. And spooling up the strings without moving the starting position of the arm mightby Dejay - Delta Machines
There are "print it forward" threads where you can ask for 3D printed parts. People who received free parts there hopefully still read those threads and can help you out Also there is 3dhubs.comby Dejay - Delta Machines
These pictures made me think about how awesome it would be to be able to 3D print something like this. These ornaments where apparently created with a laser cutter and about 150 thick paper sheets stacked on top of each other. The blog post contains even more beautiful examples. Of course full color mixing would be needed and possibly a different kind of material (more dull instead of shiny plastby Dejay - General
QuoteMutley3Dlegal onions I hate those! But www.defensivepublications.org sounds great, thanks for the info A2by Dejay - General
Really sorry to hear about your troubles. It really sucks that you got ripped off :/ I know from personal experience running a business (and crashing and burning it lol) it is very hard if you don't have the right disposition. Especially if you are an idealistic engineer that wants mainly to create not earn. Businessmen know how to deal with engineers, but it's not always the other way around. Yoby Dejay - General
Thanks for the info Turutk! I'm waiting for new fans to maybe replace it, but I will most probably design an air flow for the whole bottom section of my Kossel Mini so that I'll just disable the fan inside the power supply and have 2 bigger fans cool the electronics, steppers and power supply..by Dejay - General