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General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: RepRaper "RepRap Walmart" Chinese Filament Closed? - 12 years ago
A someone clever on IRC reprap once told me, "garbage in = garbage out" or you are paying for it in some other way, like countless man hours.by Simba - General
Re: Calibration contest - 12 years ago
STLs (stereo lithography) are no less reprappersy than any other design. I think they too provide a low end version of a much more expensive machine.by Simba - Competitions
Re: Extruder Not Extruding Filament? - 12 years ago
bringjustn Wrote: ------------------------------------------------------- > Simba not to sound disrespectful, but really? You > don’t know what a hobbed bolt is? Hobbed bolt > example Hah nothing of the kind. I'm just honest when I don't know something so I can learn, rather than trying to act smart at the expense of remaining clueless. Actually, in my decade of mechanical engineerinby Simba - General
Re: Your Business/Product born from RepRap? - 12 years ago
Sniper4395 Wrote: > For the lone wolf it'd be very difficult to run a > business with printers. You'd need at least one > more person with you to help Or robot.by Simba - General
Re: Are there any drill bit screw extruder heads out there? - 12 years ago
Looks like they switched from pellets in 1.1 to filament in 2.0.... no explanation why, it seems like it was on its way to working. Also, can anyone tell me why their design is on wiki as a "standard" extruder? Do they have some sort of clout/officer authority in the reprap community or are they just updating wiki's as they deem fit?by Simba - Developers
Re: Calibration contest - 12 years ago
In other words, you want the part to be useful? I've seen a plastic cured out of a $200K SL print and it was super strong and accurate. Is your reason for cutting these technologies out the general availability of them to you (having less expensive printers in your shop)by Simba - Competitions
Re: Can admin run a poll on filament usage? - 12 years ago
I love it. My vote is for a much much more detailed survey, if turnout is good for this one.... Please add # of extruder head (multi head) available (1...2...3) for me : )by Simba - General
Re: I'm DYING to know what resins are used with DLP printers for a cancer-related project - 12 years ago
VDX Wrote: ------------------------------------------------------- > ... i think you should contact Fernando > (RepRap-user 'spota') from spotamaterials dot com > - he supported me with the basic ingredients to > mix my own resin and with a premixed formula I'm > testing with ... but he has some activators for > visible light and optional fillers too ... Mr. Fernando is a GREATby Simba - Developers
Are there any drill bit screw extruder heads out there? - 12 years ago
I just realized this in the last few days: people extrude filament (like the filabot) using screw extrusion. Why then do we use filament + a hobbled screw or gear? Would it be possible to use a drill bit in a tiny hole and perhaps add a continuous servo for an ultra cheap extruder head? The way this would work may or may not include filament, but it may be ideal for an ultra-inexpensive head tby Simba - Developers
Re: Calibration contest - 12 years ago
How about a B9Creations style machine? Shoudn't they print 50 micron resolution (0.005 mm) in theory crushing anything a FDM printer would do? Would the parts be function or too brittle? They seemed sturdy when I held them, but I wouldn't trust them to hold up to long term exposure to the elements or vibration...by Simba - Competitions
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
PomeroyB Wrote: ------------------------------------------------------- > Very cool, Simba! Are you running it through an > extruder with a hobbed bolt? Does the 400% stretch > affect the way it is pulled through? The 400% stretch only applies when the polymer is thinner than about 0.5mm. At 3 mm there is practically 0% stretch. It's a weird material, but more easily understandable onby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
DrDave Wrote: ------------------------------------------------------- > Guys, > > I am a chemist with experience in development and > testing of polymer thick film "inks" (pastes) for > electronics applications. Me too . I worked in the conductive polymer lab at University of Maryland for 5 years. I'm glad you pointed out some of the issues and agree with you completely. Oneby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
Weldingrod1 Wrote: ------------------------------------------------------- > I contacted Ori-Tech and they told me that they > aren't willing to make me 1.75mm TPE filament, > even if I bought 5 kg! Frustrating! This is useful to know, though from personal experience with 3M and Adhesives Research, you need a minimum order about $25K-$30K....so yes, far more than 5 Kg :-Sby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
Have Blue Wrote: ------------------------------------------------------- > Simba, what are the specific resins you're looking > to extrude? I'm always interested in testing new > materials, but knowing specific material > properties is pretty important. Hey guys, sorry I haven't kept every as up to date as I wanted - mainly me and my partners in maker-crime were building the websitby Simba - General
Re: Webcam anyone? - 12 years ago
Yes I did for a while, but I thought it was causing crashes : ). Aatually, found out later that switching the fan on (for tall builds) causes a surge into the ATC which choked the RAMPS controller somehow! Weak.by Simba - General
Re: nichrome heated bed - 12 years ago
I can not get Prusa MG2 to exceed 105 C often (115C with much difficulty) and not using a fan (light fan < 65C). I think it draws around 40-50 watts like your numbers say. So 150C seems difficult to me unless you insulate the bottom. Did it work yet? I love the Nichrome idea, it so cheap and simple.by Simba - General
Re: The next generation of the Reprap concept - 12 years ago
jzatopa Wrote: ------------------------------------------------------- > The original idea behind the Reprap was a machine > that could replicate itself and would evolve as > people required. A wonderful idea which has > brought us all here today. The problem is that > the technology and designs have quickly run into > limits due to materials available and the cost of > gooby Simba - General
Re: Extruder Not Extruding Filament? - 12 years ago
Hey Guys, I do not know what a hobbed bolt is, but I had this problem and solved it! As with the recently designed heater bed, it suffers from very long, thin screws with springs that are too weak. TIGHTEN IT all the way. Also bear in mind, this may (will?) change your filament extrusion multiplier a few percent. However, that didn't work so reliably for me long term so I hacked the screwsby Simba - General
My thoughts and account of this years Maker Faire 2012 NYC - 12 years ago
Hey guys, I just thought you might be interested my account of this years NYC Maker Faire event, posted here: Armani Creations. I will also add the following info for the RepRap forums that the Maker Faire 2012 nearly blew my mind. It totally blew my mind, the amount we learn in just a few hours during two days, how fourthcoming and friendly and truely American makers were, and that made me proby Simba - General
The 3D printer of the future has 6 primary materials - 12 years ago
This post did not receive any comments on reprap before, so I wanted to bring it up again. I've detailed it out in my blog here: but I would like to rehash it plain and simple. If you can print the following 6 types of materials, you can make almost anything that is a common functional "as seen on TV" type item, but may stretch with some imagination into printing a full automobile. Quote Theby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
Hey, Today we extruded some 3 mm diameter clear rubber....based on these runs I would say the rubber is somewhere between Shore A Duro 70 and 85. It is also unique stretchy (like a rubber band) with nearly 400% stretch, and yet it is quite a tough materal. For example, to drill some rubber cast in a 3mm ID aluminum tube damaged the aluminum significantly (with a <3mm drill bit). Howeveby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
droftarts Wrote: ------------------------------------------------------- > Rubbery and low temperature waxy filaments get my > vote, for mold making and casting, especially > after seeing this [3dtopo.com] > Very happy to be a beta tester for you!I For those requesting rubbery materials, it might help to define the kind of rubber, because it's probably a good start but not a one-sizby Simba - General
Re: New Filaments - Heavy Weight, Rubbery, Conductive, Semi-conductive - 12 years ago
These are still in development, but generally they run around 185 C because they are embedded in PLA or ABS. The rubber may need to run up to 230 C The waxes run around 85 C. It seems like weighted-polymers are of great interest so we are starting out focus there. As nicely summarized here: Weighted polymers add a great look and/or feel of quality to a product. They add impact resistance andby Simba - General
I'm DYING to know what resins are used with DLP printers for a cancer-related project - 12 years ago
Hi Guys, So, in my real job we want to use the DLP printer + resin approach as applied to a specific kind of diagnostic test (they won't let me go into details - sorry that isn't very reprappy). Anyways, its killing me that I can't find a photo resin that compares with the juice that is used by B9 Creations DLP system, or Envisiontec.de (http://www.youtube.com/watch?v=4UDhk5Irsgk&feature=reby Simba - Developers
Re: Can I print my own timing pulleys? - 12 years ago
How about printing a timing belt with a flexible material?by Simba - General
Anyone near DC/MD/VA (USA)? We have a small meetup - 12 years ago
Hey! A group of us meet up regularly near Bethesda or College Park once a week. We talk about technology over lunch, and topics frequently include entrepreneurial pursuits, 3D printers, technology news, robotics, etc. We are a small group but I wanted to reach out to meet new guys. All that I ask is that you are a positive -spirited person, because the synergy of our group is unique - when oby Simba - General
Re: Non heated bed question - 12 years ago
they sometimes have adhesive backed ones. PLA might make sense too. It was dumb of me not to think of it before: thick tolerance part cost 0.007" ±0.050" 1104T311 $1.65 177.8 micron thick.... ignore the tolerance, its ridiculous. It's usually accurate to within a few microns thickness... No adhesive on this one. A mesh might be better if you are heating the base thouby Simba - Developers
Re: The death of Thingiverse? - 12 years ago
VDX Wrote: ------------------------------------------------------- > ... Chinese folks thinks different over IP than we > do - for a Chinese it's a honour to be copied, as > this will elevate him to the level of a 'guru' or > teacher of wisdom! > > So for them our 'fuzz' about IP's and such isn't a > valid point in the game You know, Viktor, when I was younger (I'm only 28by Simba - General
Re: The death of Thingiverse? - 12 years ago
akhlut Wrote: ------------------------------------------------------- > > > > > 3.2 License. You hereby grant, and you represent > and warrant that you have the right to grant, to > Company and its affiliates and partners, an > irrevocable, nonexclusive, royalty-free and fully > paid, worldwide license to reproduce, distribute, > publicly display and perform, preby Simba - General