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Re: PET bottle linear bushing - 12 years ago

Looks like an interesting trick to me. You might like some of the discussion in this thread: DIY linear bearings (no PLA), although your method is much simpler. I think PET strips from bottles might work really well as living hinges in compliant mechanisms, such as this or this. You could also use PET strips for a double lamina compliant joint (DLCJ) like this one, but I am wondering a bit off

by MattMoses - Developers

Re: Filament closes to caucasian skin color - 12 years ago

That was my second guess, honest.

by MattMoses - General

Re: BrickRap = My entry for the Gada(Uplift) Prize (if it is still alive - 12 years ago

Welcome, Ediweber! It is always a pleasure to see new people contributing to the forum and wiki, especially those interested in self-replication! I hope you continue to document your progress on the wiki. Is the machine shown with the caption "V2 is the first working X-Axis carriage" entirely printed, except for the motor? I like it. It reminds me a little of this lasercut linear slide mechanism

by MattMoses - Kartik M. Gada Humanitarian Innovation Prize

Re: Filament closes to caucasian skin color - 12 years ago

What a curious question! I don't know the answer, but I am curious about the question. I am guessing that you are building something for a prosthetics application, and you want a close match between the device and the recipient's skin color? Richrap has done some work dyeing Nylon 618 filament with some pretty spectacular results. This probably would work with other filaments too, and you can

by MattMoses - General

Re: 3D lathe - 12 years ago

There was some discussion a while ago in this thread. The only working example I am aware of is this one by Yoav Sterman (built as a class project for one of Neil Gershenfeld's classes at MIT). Anyone know of any others?

by MattMoses - Developers

Re: 3D printer from electronics waste - 12 years ago

This project is getting some more press lately. Here is an article on hackaday.

by MattMoses - General

Re: 3D printer from electronics waste - 12 years ago

Here is an update in a recent short news feature showing a printer in action.

by MattMoses - General

Re: Thingiverse Alternative poll on Reddit - 12 years ago

For anyone interested, recent discussion on Hackaday about this: The problem of Thingiverse.

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

QuoteRP Iron Man I think that if people in RepRap ever started to disrespect the intended use of a design (ie. NC) then developers would stop working within RepRap because the community will have lost it's morals/direction. You have this completely backwards. Developers come to RepRap to get ideas, advice, free technical support, and more. When "people in RepRap" lose their "morals/direction"

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

Please see the Licenses and Hardware section of the Open Source Hardware (OSHW) Statement of Principles and Definition v1.0: QuoteOSHW Definition 1.0 In promoting Open Hardware, it is important to make it clear to designers the extent to which their licenses actually can control their designs. Under U.S. law, and law in many other places, copyright does not apply to electronic designs. Patents d

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

Quotebobc They are enforceable only if the owner of the IP has the means to pursue an infringement claim. No, not even that. If we are talking about an all metal hot end, an NC license is not enforceable at all, period. Regarding the functional characteristics of a piece of hardware NC licenses provide no protection whatsoever. If you want to protect that aspect of your design you need a patent

by MattMoses - General

Re: Working Electric Motor Printed - 12 years ago

Add another one to the list! Solenoid Engine

by MattMoses - General

Re: Compopoly - a fairer reward system for value creators? - 12 years ago

QuoteTraumflug I'd love to see such stuff everywhere in the RepRap wiki, on each page describing a hardware or software. This is a neat idea, but how exactly would this work for hardware? Would a page have a list of items that need working on, and someone (the holder of a paypal account?) would keep track of how much money was pledged, and send funds off to people that did the work? It seems l

by MattMoses - General

Re: Water cooled all metal hotend - 12 years ago

You design many hotends, cozmicray? The thermal break is a challenging part in all of them, and the source of many problems. Even commercial units use active cooling - see the Stratasys Dimension teardown linked from this thread. Plenty of people think water cooled hot ends are a good idea. Here are two other examples besides Xabbax's: RepRapPro Water Cooled Hot End Greg Frost's Water Cooled H

by MattMoses - General

Re: Water cooled all metal hotend - 12 years ago

Nice, Xabbax! Thanks for sharing! QuoteJasper1984 Drilling a 0.5mm hole in that domed nut sounds hard There is a description of a simple way to do this here.

by MattMoses - General

Re: Difference Between RepRap Machines and Professional Machines - 12 years ago

Quotevegasloki OTOH the heated chamber is being used by Reprapers SLS is also being used by Reprappers.

by MattMoses - General

Re: Thingiverse Alternative poll on Reddit - 12 years ago

Thanks for the new license options, Wil. Especially Public Domain - that's my favorite one. Actually, my very favorite open source license of all time is the WTFPL but I don't expect you to add that one to cubehero! Regarding Thing Tracker Network - I still don't fully understand how it is supposed to work. I am guessing someone, somewhere has to build and maintain the tracker, but I don't kn

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

If it works, it works. I say "stark contrast" because the GPL and CC licenses mean something when it comes to software and works of art. When it comes to a hardware design they mean nothing more than a polite request (which, as you point out, can be quite enough in most cases). People seem to think that a CC or GPL license on their hardware design will offer them protection equivalent to, say

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

QuoteTraumflug It doesn't have to have "legal teeth". It's sufficient when people respect the intention and that's what (to date) mostly happens. This reinforces my point that sticking an open source license on a hardware design is no different from politely asking people not to rip you off. It may work most of the time, it may make the designer feel better, but it is still kind of pointless. Ri

by MattMoses - General

Re: Difference Between RepRap Machines and Professional Machines - 12 years ago

QuoteHave Blue a lot of it comes down to certain things still being protected by patents I hear this a lot but I think it is a myth (started by speculation from a guy called Duann Scott and propagated in articles like this one). Other than the Formlabs vs. 3D Systems dispute, which 1) involved a large sum of money and 2) has been settled, I don't know of any specific cases where an improvement t

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

Quotejohnrpm can someone provide a concise answer No. Because it's complicated. Papers have been written about this (see for example The Intellectual Property Implications of Low-Cost 3D Printing by Bradshaw, Bowyer, and Haufe). Tons of legal books have been written about IP law. It's complicated. A very important thing to remember about all these open source license options is that they were n

by MattMoses - General

Re: Working Electric Motor Printed - 12 years ago

QuoteSimba Can you tell me more about this piezoelectric properties you want? What is this good for? QuoteNicholas Seward Why should we care? We could use this polymer to make stepper-less RepRaps and do all sorts of other neat tricks. Here is a short list of actuators that can use this. [*] Traveling-wave Motor [*] Inchworm Motor (Linear motion) [*] Rectangular Four-Quadrant Moto

by MattMoses - General

Re: Working Electric Motor Printed - 12 years ago

Simba, have you tried making, say, an electromagnet using your iron filament as the core? I've tried using iron-filled epoxy for actuator tests and it didn't work very well... Results here. Also, while you're making new filament materials, how about piezoelectric PVDF? Automatically poled during printing?

by MattMoses - General

Re: Cubehero launches OpenSCAD previews - 12 years ago

Cool! A 3D viewer with zoom, pan, and rotate would be really nice. Also, is it possible to start a conversation on a particular item's page? For example, if I am viewing Gene Hacker's Printable Stepper Motor, can I leave comments and view the replies on that particular page?

by MattMoses - General

Re: Working Electric Motor Printed - 12 years ago

Gene - Thanks for all the info! Jeremy - No problem. Glad you saw them eventually There's another one on youtube here, with rare earth magnets and hand wound coils.

by MattMoses - General

Re: Working Electric Motor Printed - 12 years ago

Cool! It is hard to see what is going on, but to me it looks like they are adding bearings, magnets, and wire. This work is from the Keck Center, the same group that is working on metal FDM (see Fused Deposition Modeling of Metals by Jorge Mireles, et. al. ). The Keck Center website shows several objects that look like they have embedded metal traces in them, so I wonder if this motor actual

by MattMoses - General

Re: Thingiverse Problems? - 12 years ago

If you are on a low resolution monitor, sometimes the download button will mysteriously disappear if your browser window is too narrow. I've had this problem using an older laptop running Windows XP.

by MattMoses - General

Re: An internal struggle between the "we" and the "me" on the community and IP - 12 years ago

You are over-thinking things, Simba. On the reprap forums there are dozens of successful business operators and their philisophies on how much info to release cover the spectrum, from "completely open" to "as closed as we can possibly be without chasing away all our customers". You want to share things? Great! You don't? Fine. People are going to complain no matter what you do. Just do something.

by MattMoses - General

Re: Grounded Experimental Delta Printer - 12 years ago

Quotenicholas.seward expanding foam This has probably come up elsewhere in this thread, but just in case it hasn't... Watch this robot build other robots out of spray foam

by MattMoses - Delta Machines

Re: Grounded Experimental Delta Printer - 12 years ago

QuoteRalphxyz But what would you use for a extruder hot end on a big Simpson? This one by Dirk Vander Kooij has a layer height of around a centimeter. Contour crafting (pioneered by Behrokh Khoshnevis) uses a concrete extruder and has been used to build concrete walls.

by MattMoses - Delta Machines