This thread in the Prusa forums seems extremely relevant:by oysteinkrog - General
Cool, but overkill. The weight of the carriages will mean that you need to reduce acceleration.by oysteinkrog - General
RuRAMPS4D is IMO the best low-cost option:by oysteinkrog - General
Marlin has seen a lot of changes recently, much improved step generation and both s-curve acceleration and junction deviation is now implemented and working well. There seems to be even more improvements in the loop. As far as I can see Marlin is now superior to all the other firmwares in this regard, especially since it is soon getting s-curve based acceleration WITH pressure advance compensatioby oysteinkrog - General
Designing a board for 12V with TMC2130 is a major mistake.by oysteinkrog - Developers
@matthock Wow, I'm really excited to see how far you've come with your design, awesome job! I'm convinced this is one of the next big innovations for 3D printers, and I'm eager to incorporate it into my own printers. Have you done any stress-testing of this motor/gearing setup? When I'm testing my extruder/motor/gearing designs I often let the setup run with an extruder/retract script (without thby oysteinkrog - General
The Prusa i3 is an openscad-based printer design, just look up the code on github and you can see how everything is designed. There is no single set of drawings as the design is parametric, so the geometry of the parts depend on what configuration values you use. If you want an xcarriage design that uses more screws you can look at the "prusa i3 rework" carriage, a lot of extruders now use that sby oysteinkrog - Developers
I bought a 1.75mm J-head clone from reprap.me, when I received it I found that it was one of these 3mm + 1.75 PTFE tube conversions. My experience with it was horrible, the big problem I had was that it seemed that the melt chamber was waaay to big, which meant that when starting extrusion there was some lag (as it built up pressure) before it started pushing out melted plastic and when stoppingby oysteinkrog - Plastic Extruder Working Group
I got this working by connecting the servo to one of the unused pins (D40) and modifying the firmware. Here is the G+ post with some details: Here is the commit with the changes I made to marlin: I basically connected the fan extender to the normal place (and did not jumper the 5V header next to it, just connected 12V to the extra board according to the docs). I then modified marlin to defineby oysteinkrog - Reprappers