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Plastics, Epoxies, Resins, Photopolymerization, etc - Research, Development, Use, and Analysis -> http://objects.reprap.org/wiki/Plastics
Re: 3D cement printer - 10 years ago
The following idea is published under the LRC licence, it is free for all personal use For commercial use, who owns the license, the concept outlined has been around for at least 15 years to my knowledge.by johnrpm - General
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
This post was a genuine attempt for a simple solution to a complex problem, I tihink if some thought was put into it, it could work, but this has largely been ignored. johnrpm Wrote: ------------------------------------------------------- > As I said before, I am more than happy to share > with fellow tinkeres and experimenters, but not > with someone who just wants to make money. >by johnrpm - General
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
How about improving this one? All the means required are here, you "just" have to show your ideals actually work better than the commercial-centric approach. No point trying, as you already stated that reprap is mainly shop keepers To achieve this, you'd likely have to get rid of all the shops and their owners, first. The sole purpose of running a shop is to make money. Regardless wether it's oby johnrpm - General
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
My estimate is, you're one of very few. No objection with this, I'd like to do development, only, too. But I had to decide wether I wanted to do RepRap stuff 100% or another job and only 10% RepRap. My choice was the former. Well this confirms I am naive, I thought this was a place to share ideas and create something, not a collection of business people, I suppose I had better look for a communby johnrpm - General
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
Our views of the reprap community must be very different, or is it just me who is not running a shop?. Traumflug Wrote: ------------------------------------------------------- > QuoteAs I said before, I am more than happy to > share with fellow tinkeres and experimenters, but > not with someone who just wants to make > money. > > To achieve this, you'd likely have to get rid oby johnrpm - General
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
As I said before, I am more than happy to share with fellow tinkeres and experimenters, but not with someone who just wants to make money. therefore, this may be a naive idea, but why not have an area of the wiki for NC, clearly stated as such, developers can choose to post their work in the gpl or nc area. I am the first to admit that I have not thought this through fully, and it may not work.by johnrpm - General
Re: Auto Orienting STLs - 10 years ago
I feel a right burk, the stl files are all about 27k, right clicked them and selected save as, so tried a different stl file and it worked, both orient.py and reorient.py, so it was my fault, although I can not see how else to download them. So sorry to waste your time Edit, it seems that it works with ascii but not binary files, unless its me again.by johnrpm - Developers
Re: Auto Orienting STLs - 10 years ago
Sorry still getting the same error, (edited it in geany) am I missing a module ?. Processing: prism.stl Traceback (most recent call last): File "orient.py", line 209, in s=solid(sname) File "orient.py", line 71, in __init__ data=struct.unpack("12f1H",f.read(50)) struct.error: unpack requires a string argument of length 50 P.S no rush if you are busy.by johnrpm - Developers
Re: Auto Orienting STLs - 10 years ago
python 2.7.3 on linuxlite, an ubuntu derivative. Edit, perhaps I am missing a python module ??. Hmmmm Tilt-n-Twirl.by johnrpm - Developers
Re: Auto Orienting STLs - 10 years ago
thanks for doing this, as far as I know their is no auto orientation software, but I may be wrong. Edit, getting this error message, am I doing something stupid?, Hmmmm tilt&twirl. Processing: prism.stl Traceback (most recent call last): File "orient.py", line 209, in s=solid(sname) File "orient.py", line 71, in __init__ data=struct.unpack("ffffffffffffH",f.read(50)) struct.errby johnrpm - Developers
Re: [Slightly off-topic] Open-source and the reciprocal economy - 10 years ago
This is a proposal for a semi-commercial engineering organisation - i.e. partly commercial and partly non-commercial. A broader aim is that it will provide a stronger integration of the open-source movement on the one hand and anyone interested in a reciprocal (or ‘non-commercial’) economy on the other. Bobc, I do not read it that way, it apperars to be a wider context, but that is just a quessby johnrpm - General
Re: Professional Arburg freeformer using plastic pellets - 10 years ago
One mechanical nozzle movement for each droplet? That's quite a bit. yes, but it can handle high viscosity, also the frequency can be high, material dependant of course.by johnrpm - Plastic Extruder Working Group
Re: Fibre Core co-extrusion - 10 years ago
Approx 25 years ago I made a co-fibre extruder, it premade the fillament though, the 3d printer needed a flying cutter to cut the fibre under the nozzle, I had to build the extruder, then build the 3d printer, in those days stepper motor boards and software were not off the shelf. it was a very interesting project.by johnrpm - Wire and Thread Embedded Extrusion
Re: Small Injection Molding Unit - 10 years ago
A small bench top injection moulder is not difficult to make, a friend of mine made one years ago, a drill press could be modified, tooling may be more of an issue.by johnrpm - Plastic Extruder Working Group
Re: Professional Arburg freeformer using plastic pellets - 10 years ago
this is a similar concept to the first air brush patent in around 1900 by pasch, (not sure of spelling), and similar to something I have been working on, (on and off) for a while, the polymer forms discrete spheres, (maybe for the salke of the video), metal spheres welded together have also been mentioned on the forum. so nothing new under the sun, we have no shortage of ideas, but a lack of devby johnrpm - Plastic Extruder Working Group
Re: DIY printhead - 10 years ago
Yes 120v is dangerous, but you could use a stepup transformer to give the volts but not the amps. it should work at a lower voltage, but for wax he may have needed the extra. please keep us informed and add to the wiki page or start you own.by johnrpm - Powder Printing and Selective Laser Sintering
Re: DIY printhead - 10 years ago
Don't know how I missed this, excellent stuff, he is printing hot wax. his circuit looks good to me, but electronics experts would give a better opinion, no mames but the previous poster comes to mind.by johnrpm - Powder Printing and Selective Laser Sintering
Re: DIY printhead - 10 years ago
Its been so long now that I have forgot most of the details, if you put a link to the circuit you are trying to build we may be able to come up with something.by johnrpm - Powder Printing and Selective Laser Sintering
Re: GCode standard test? - 10 years ago
could you use the standard output from slic3r, it would give a template to work to ???.by johnrpm - General
Re: DIY printhead - 10 years ago
Looks like a sensor, how would you use it ???, I am working on a deposition head that may deposit many materials, if I get it working I will publish the whole thing, but its not woking yet.by johnrpm - Powder Printing and Selective Laser Sintering
Re: An internal struggle between the "we" and the "me" on the community and IP - 10 years ago
snip> and we should understand how to make it work I hoped that bobc would expand a bit on this as I value his input, I get the feeling that amongst other issues makerbot going closed source etc, the community has not yet found its place in the world, if people become dissilusioned we could loose some people who could make a difference, I must admit that I do not feel that everything in theby johnrpm - General
Re: has anyone else tried DesignSpark Mechanical.? 
- 10 years ago
NormandC I use linuxlite, the best operating system in the world, ubuntu based. you have sold freecad to me, I shall install tonight.by johnrpm - General
Re: Business opportunities for home 3D printer folk? 
- 10 years ago
Who would have thought that people would be additced to telephones and social media, takes all sorts.by johnrpm - General
Re: has anyone else tried DesignSpark Mechanical.? - 10 years ago
bobc, exactly what I was thinking, I did try designspark pcb, but decided I was being lulled into something.by johnrpm - General
Re: Having a RepRap issue tracker and RepRap bounties. - 11 years ago
Not sure if this is of interest, self hosted.by johnrpm - General
Re: Compopoly - a fairer reward system for value creators? - 11 years ago
vegasloki wrote The market for 3D printers including Reprap type printers has changed from one of developers to one of consumers I think their is more than a little truth in this, but a vast amount of development is needed to achieve self replication, and if that is to happen we need a lot of people to become active developers and not just users.by johnrpm - General
DLP laser - 11 years ago
A question for the laser experts,not about engravers but, As slow progress is made on my DLP 3dprinter, I am now thinking of different light sources, the plan is to have interchangable "lamps" including a 405nm laser, can anyone advise me on a goog one to buy, preferably with driver, and the optics needed (I assume) to defocus the spot into the light gate, will I need a beam expander?. I undersby johnrpm - Laser Cutter Working Group
Re: An internal struggle between the "we" and the "me" on the community and IP - 11 years ago
bobc wrote Open Source really is a radical way of thinking about how IP is owned and used, which most people are not used to, and uncomfortable with. However, it does actually seem to work, and we should understand how to make it work, rather than take the lazy path and bastardize it to turn it back into the closed source model we are familiar with. Thanks for the explanation, i genuinly am tryby johnrpm - General
Re: Open Hardware helps build communities - 11 years ago
Maybe when this license thing is resolved and the community agree on a way forward, if anyone abuses the license they will be black balled, and the fear of this may be enough, otherwise if lawyers get involved the cost of defending would need an overseeing organisation which in turn would need funding. Example, fur coats were every womans dream, until the cruelty campainers made it moraly unacceby johnrpm - General