QuoteVDX ... you can use "chips", sheets and prefabbed/shaped parts of this "compacted wood" for "puzzling" too - so a form/structure made of foam and after (or while puzzle-fabbing) coated with bullet-proof wood chips should be strong/rigid enough Not sure how you would shape wood chips. And I think wood is only really as good as the lenght of the wood fibers. You could slice wood veneer (e.gby Dejay - General
I do think you need some kind of composite material. Concrete with rebar is a composite material, without the rebar providing the tensile strength it wouldn't be any good. You could either laminate continous fiberglass rovings or spray chopped strand fiberglass with a copper gun. Or maybe even mix chopped fiberglass into the foam mix on the fly. Maybe you could also use spray concrete with basalby Dejay - General
I mean especially the foam printing patent filed by the MIT. Your post is definitely prior art to at least the basic idea of printing houses using foam. I was previously somewhat discouraged this is patented. It's also nice to see that no idea of mine is ever original haha. All the ideas in this thread were basically already there in 2011! I think 3D printing buildings with foam has a huge advanby Dejay - General
Oh that is interesting VDX. This even predates the MIT patent! (2007 vs 2013)by Dejay - General
Yeah I think you are right. I might have wanted to ignore that for now There are other problems as well like how would you 3D print such large structures without warping when the plastic cools. This might just not work, and the approach to freely spray foam and mill it to shape might just be much easier. Does PU foam create pressure even if the form is open to the top to let the foam expand upwby Dejay - General
So I had another idea for a more practical and simple solution to this: You could simply print thin shells for the walls out of normal 3D printer plastic, then spray foam into them and add laminate fiberglass cloth on the outside by hand. So every 20 or 30cm you would stop the print, use those 2k PU foam spray can's to fill up the wall shells with foam (the spray cans are pretty cheap comparedby Dejay - General
Haha I've actually just seen something like that here. But I figure that was made by a removable mold. "The Bug" does exactly what you describe though, but the whole roving is drenched with UV curable resin. I guess the right way to think about this would be that you want to print with fiber in a plastic matrix, not extrude plastic together with some fiber. You want as much fiberglass as you canby Dejay - General
So after learning a bit more about PU Foam and fiber reinforced plastics (for a rather simple project) I just want to add a few thoughts and ramble a bit Yesterday I remembered continuous fiber printing. It might be much better to build up a shell for the walls and then filling this shell with foam. That way you don't need to mill foam away and then spray on fiberglass. It allows more detail anby Dejay - General
QuotePDBeal There's always the concrete 3d printer. Of course, he didn't print a house, but still I'm sure the application could be adapted. Yeah I've seen and love that little castle! Apis Cor made a 3D concrete printer as well and they use "eco-concrete" which has the advantages of creating less CO2, contains reinforcing fibers (no rebar needed) and most important of all also being betterby Dejay - General
For the installation, I guess you'd just have to plan ahead. Electricity would be easier than plumbing. I would simply have a cable channel going around all the walls around the house (on table height!), so that you can always push in new cables and drill new though-holes into the cable channel if you get a new TV or lamp. And if mess up your planning (like you do), you could always cut into a waby Dejay - General
I've attached a demonstration of the idea and my lack of skills in Fusion 360 to the original message. Imagine there would be cameras and QR codes on the towers and the effector platform. It would probably be better to design with 4 towers and 8 cables. That would make the calibration more complex. Small link collection: Hangprinter B&TRap (page has some more links) Path planning for cby Dejay - General
Well for boats / yacht moulds this might work too. Although this is already done just using CNC on big blocks of higher density PU foam for a stronger mold and more precise surface finish. Since molds are reused lots of time and only in series production, optimizing the building costs of a mould for a yacht isn't that efficient. Ideally this technique would be use for building one-offs like a hoby Dejay - General
Thanks Zed²! UV could be an excellent option. I wonder if UV curing resin can be stable in sunlight? You could apply a top coat of course that doesn't have to cure before the next layer. The trusses don't need to be very strong though, since they only carry like 50kg max and can be tightened using cables tethered to the ground like a tent. The moving parts would be rather lightweight. The cheaby Dejay - General
A thanks, those stage lighting profiles (stage girders?) was what I was thinking of but didn't know what they are called! Of course in the spirit of reprap those poles / girders should be 3D printed as a fiberglass / foam sandwich And I know this is going to be a rather rambling discussion on my part, it's just an idea that I keep thinking about so I want to share / discuss it. I should probablby Dejay - General
So for a while I've been interested in 3D printing houses and more recently at container homes and tiny houses. Apis Cor is doing some cool things using eco-concrete that you can extrude. Container homes are a nice idea as well. But the problem with all of these for the colder or hotter climates is that you still need to add or fill in insulation and add weather cladding, paint it, make it airtigby Dejay - General
Sorry Pascal And now all say it with me. DeJAY Actually the Y is silent, it's like Dejahby Dejay - Delta Machines
Now that's interesting! I had no idea that is what you where talking about Also every time you talked about forks I got hungry and distracted I'm sure Nicholas can tell you better, but I think the mathematics are still the same. Any horizontal movement of the effector / arm screws each carriage up and down the lead screws. I don't think this is a big issue either way except for homing and probby Dejay - Delta Machines
Thanks Grandag! I just wondered if there is a SMD thermistor hidden in there. Would be cool but probably unpractical if you ever need to replace it.by Dejay - Delta Machines
I just got the sintron heat bed for my kossel (different model). I haven't read the whole thread (it's long!) but wonder if there are any tips about attaching the thermistor to the heat bed? Would it make sense to drill a small hole into the center of the PCB side for the thermistor? Also, what are those components on the PCB? Two diodes and a resistor? Or is that a SMD thermistor? Because theby Dejay - Delta Machines
Thanks this is great information! Would be cool for someone to measure play, friction and noise compared to wheels.by Dejay - Extruded Aluminum Frames
Yeah I'd be curious about that too. I figure it is transparent for visible light. Is it opaque in infrared or ultraviolet? The PA6 is basically polyamide. Thanks for posting aksechems if the 3D laser sintering ever gets off the ground we need companies that supply small quantities to makers.by Dejay - Powder Printing and Selective Laser Sintering
Well you just send them the required STL files in a zip file. And in the worst case there is always duct tape (Or zip ties or super glue)by Dejay - Delta Machines
Maybe check out the deltabot google group and this thread: Afaik it doesn't matter too much that someone has the same printer (although there is a certain poetic appeal to it ) It's more important that they have a well working machine.by Dejay - Delta Machines
There is a german section - not that easy to find though: Also there are specific threads for people who "print it forward". Once you get your parts you remain subscribed to the thread and print a set out to the next one who needs em. Can't find the fitting thread though. You can also check [3dhubs.com] to try find someone nearbyby Dejay - Delta Machines
I guess for certain applications the price for a linear motion unit including ball bearing would be quite good. But reprap mostly is looking to be cheap and precise. And reprappable Also afaik deltas need faster speeds than 12x4 leads screws afford. V-Slot has a "C-Beam" now that also offers a partially enclosed linear motion unit:by Dejay - Crowdfunding Projects Announcements
I think machinekit (emc) have implemented handle general serial link kinematics. Replicape kickstarter is up right now which can run machinekit.by Dejay - Polar Machines, SCARA, Robot Arms
There is also the idea of "flexible drive shaft extruder" like this oneby Dejay - CoreXY Machines
Not quite sure how DC42's calibration works. Afaik the 7 factors that are calibrated are: https://github.com/dc42/RepRapFirmware/blob/dev/DeltaParameters.h float diagonal; // The diagonal rod length, all 3 are assumed to be the same length float radius; // The nominal delta radius, before any fine tuning of tower positions float xCorrection, yCorrection, zCorrection; // Tower pby Dejay - Delta Machines
Quotesteve806Any ideas how to seal PLA prints so they are air tight to around 3 bar? Maybe try sealing with epoxy or polyurothan resin.by Dejay - Delta Machines
It's nice to see a new fixed version but any news on the fix? Has anyone done this yet? I'm hesitant to order a replacement part for >15€ including shipping. Or does the suggested solution from o_lampe work? I mean why do we need a 5V regulator if we power over USB?by Dejay - Controllers