This will also keep the printing environment more controlled by blocking any drafts that might cross the build plate. Instead of leaving the sides open, I decided to put paneling on them to give it much cleaner look. Since this is going to be a pretty large printer, 52″ x 29″ x 29″, I wanted unnoticeable as possible. Now by using a NEMA 23 that has a torque and current rating of 425 ozf*in and 3A, respectively, I can get a theoretical torque of 85 ozf*in at the same current as the NEMA 17. The motors are typically run at a max current of 0.6 A, so you would get approximately 1/2 the rated torque of the motor, 20 ozf*in. the recommended holding torque for a standard Reprap is 19.4 ozf*in () although it is probably a little dated, so let’s say 40 ozf*in coming from a NEMA 17 with a current rating of 1.2 A. Since I want to go big, I need to go big on the motors as well. NEMA 17 motors are great… for smaller sized printers. They figured out that while the standard CoreXY is a good system, it can be even better by running the belts at 2 different levels and avoiding the dreaded cross over. The guys over at FabTotum did a critical analysis of the CoreXY gantry system. (I say “most” because there no bottom square yet. So I picked up some fasteners and fastening plates from 80/20 and finished up most of the frame. I had bought a lot of 40mm extrusion off eBay back in the fall, but that was about it. Im the meantime, you can check out the discussion about his extruder design on the forum.

There will also be a separate post just about the extruder. I redesigned his extruder to be a bit more user friendly, and I will definitely be putting his claims of swinging the extruder by the filament without any slippage to the test to really see how much this extruder can hold. He uses a a MIG welder driver roll in combination with a 100:1 geared stepper to get very high torque and an extremely reliable stepper.

Since I am an avid member of the forums, I came across an extruder used by the user cnc_dick. That’s a 500mm x 500mm x 500mm build volume! I am planning on adding another ~150mm in the X direction and ~60mm in the Y direction later on, but for right now I just want to get the thing built.ġ00:1 geared extruder with MIG welder drive roll

T slot frame 3d printer single arm