Greg's right - for T2.5 you will need machined pulleys - the details are just too fine for today's printers. The rest of the set would be perfectly suitable for use with T2.5 belts, though.by raldrich - Plastic RepRap Parts for Sale
This is a complete set of all the Prusa Mendel printed parts, with Greg's extruder. This set was printed from the latest "Iteration 2" sources, and is ready to be upgraded either with LM8UU bearings, or with Igus bushings. The set is supplied with printed LM8UU sized PLA plastic bushings. All of the structural parts are printed in ABS plastic, while the bushings and extruder gears are printedby raldrich - Plastic RepRap Parts for Sale
Spenc Wrote: ------------------------------------------------------- > How about a multi headed extruding tip that can > feed 3 different colored > filaments(blue,green,red) through the same hole at > once ? > Tricky to build I know, but you could have each > filaments extruding at alternate speeds to create > different colors. > I guess it would also be a huge task to chby raldrich - Developers
brnrd Wrote: ------------------------------------------------------- > There's no need to do this since the steps per mm > on the x, y and z can all be calculated based on > the gears, belts an lead screws, If you have a std > Sells or Prusa, then these are all well known and > are already in most firmware. The extruder on the > other hand, can use an automatic calibration >by raldrich - Developers
It would seem to me that controlling your fill volume would be quite difficult, as the amount that the foam expanded would undoubtedly be temperature dependent. I would also expect that any foam which happened to make its way onto the top of an extruded layer would affect layer adhesion.by raldrich - Plastic Extruder Working Group
csw Wrote: ------------------------------------------------------- > How can you tell from the photos that both 12V and > 5V were hooked up Image16.jpg The red wire is 5v, unless he rewired it at the PSU end of the cable.by raldrich - RAMPS Electronics
As an aside, I have to wonder why the wiki is still encouraging people to build Gen3 electronics. The alternatives (RAMPS, Sanguinololu, Teensylu, Gen7) are far superior, far easier to build, and less likely to cause issues.by raldrich - Controllers
If you have two unused pins available, you could use them to run a Pololu stepper driver. Of course, you would also have to be able to recompile the firmware for your mainboard. Alternatively, you could rework stepper driver on your mainboard. Without a rework station, removing the fried chip can be challenging - I've had success by carefully cutting the pins with a dremel tool, but carefullyby raldrich - Controllers
RepRapWiki - Stepper Wiringby raldrich - Mechanics
alscorp: Getting the Z axis to step in the right direction is quite easy - just reverse the motor wires - if they're using a plug, you usually can just turn the plug around. If they're using screw terminals, just reverse their order. For the X axis, you'd do better to discuss it live with someone in the #reprap IRC.by raldrich - Mechanics
For optical endstops you want endstop pullups turned off, and inversion turned on. By turning inversion off, you basically convinced your CPU that all of your endstops were blocked, so that doesn't really test whether or not they are working. Unfortunately, the endstops that Mendel-Parts supply don't have any visual feedback, so you still really don't know if they are working or not. If you evby raldrich - General Mendel Topics
A quick fix to belt friction is to hit the fender washers with some teflon/silicone lubricant. The issue with this is that when the lubricant makes its way onto the pulleys, it'll increase whatever backlash potential that they have, so you also need to make sure that you have good pulleys.by raldrich - General Mendel Topics
@imitation: I think that one of the best improvements that might come from your idea is the reduction in the size of the x-carriage. I'm finding that the size of the extruder is one of the largest factors limiting my build area. My concern about it is the sideways pressure that it would be exerting on the carriage. Basically, now your x-carriage motor has to be able to overcome the torque appby raldrich - General Mendel Topics
I honestly don't think anyone's maintaining 5D anymore - you'd be best to switch to sprinter, teacup, sjfw or any other actively maintained firmware. My personal favorite is sjfw, but compiling it is not for the faint of heart.by raldrich - Controllers
Does it have analog inputs? I wasn't sure from the description.by raldrich - Next Wave Electronics Working Group
One of the difficulties with Wade's extruder body design is the lack of clearance underneath the motor for the bolts - Greg's redesign resolves that problem. Personally, I'd hack up your extruder body in whatever way you need to in order to make it work, and once it's working, print a replacement for it. Although, I'm not sure I'm the best one for extruder body advise, since I've printed at leaby raldrich - Plastic Extruder Working Group
Here is a pretty good handyman's reference for anodizing aluminum. The value he gives for the size change is .0005", or 0.0127mm, which comes to around 4% of a .35mm hole - I don't think it would be noticeable in most printers. If Andrew's number is closer to correct, then it clearly would be an issue. Heat, however, could be more of an issue - I found this discussion, which indicates that theby raldrich - Plastic Extruder Working Group
Like nophead, my LM8UU bearings were very tight when I first installed them - lubing up the rails with some silicone/teflon spray helped a bit, but there was still a lot of friction. Running some prints loosened things up to the point where the x-axis will move under gravity now if the belt is removed.by raldrich - General Mendel Topics
Adding support for a second extruder is pretty much a DIY project right now. Even if you could find a firmware that supports it, you still would need a gcode generator (i.e. skeinforge) to support it.by raldrich - RAMPS Electronics
mapexmbirch Wrote: ------------------------------------------------------- > Hi, I am kinda new to Reprap. Been researching it > for the past month or so and bought a partly build > one yesterday, just waiting for it in the post > now. > One question I have about the power supply that I > can't seem to find anywhere. > The electronics all take like 5v - 12v at about 10 >by raldrich - Controllers
camblonie, it's not McMaster, but Ebay has a couple of pulley suppliers. The ones there are T5, but if you're using XL belt, they would work well enough for you to print a new XL gear.by raldrich - General Mendel Topics
Devos, you might want to visit the reprap IRC. There's plenty of helpful people there, some of which have already been through the "TechZone Experience"by raldrich - General Mendel Topics
Brian, Have you considered anodizing the aluminum? It should harden the surface considerably, and I expect it would make it easier to keep the nozzle clean.by raldrich - Plastic Extruder Working Group
reifsnyderb Wrote: ------------------------------------------------------- > The same goes for the nozzle. It is cheaper and > easier (not to mention lighter and smaller), to > have one nozzle/heater/thermistor mount as opposed > to separate parts. This is even though the nozzle > is rather complicated. I've found that one of the features I like most about MakerGear's "BigHead"by raldrich - Plastic Extruder Working Group
I was able to find suppliers for SW4 ball bushings (1/4 or 4/16 inch) and SW6 ball bushings (3/8 or 6/16) inch, which would imply that the part you're looking for would be a SW5 ball bushing. Unfortunately, googling "SW5 ball bushing" doesn't come up with any useful hits, so I suspect that no one makes one that size. Since the Chinese bearing manufacturers seem to focus on metric parts, I suspeby raldrich - General Mendel Topics
I recall a 3d printer that used paper sheets which were cut with a laser, and bonded with glue. Something similar might work with plastic sheets and solvent welding.by raldrich - Plastic Extruder Working Group
I've seen it mounted underneath, or on the side - other than the bit of rigidity it adds to the frame, there's no real reason for a particular location.by raldrich - General Mendel Topics
It seems like the folks at Pololu are thinking along the same lines.by raldrich - Controllers
Down at the bottom of TechZone_Tip_Assembly, there's a link to a (somewhat old, but functional) firmware for Techzone's Gen 3 with thermocouple. I won't kid you though - you're not going to be satisfied with the extruder's performance - the software hack that is used to run a stepper motor from the Gen 3 extruder board makes the extruder noisy, and with lower torque than you would get with realby raldrich - General Mendel Topics
Apparently those who use a Bowden extruder use Restart Extra Distance as a way to combat hysteresis. It's a bit of a hack, but it makes for better prints.by raldrich - General Mendel Topics