20mm OD Conduit version of Piper 2 3D Printer (CoreXY design based on EMT conduit pipes)

by Piper3D Aug 7, 2018
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Very nice! (y)
I'd like to ask you - is there step or any other CAD model of your printer? I'd like to use dual extruder and have 300x300 print size. I need to check if it is possible with both extrudes.

2 extruders will shorten the size of the bed on X by 30mm. so if you want to have full 300mm on X you will need rods which are at least 430mm on X axis. The distance between 2 extruders is 30mm. if you use 1 extruder setup use the central hole. If 2 extruders use outer holes on X carriage.

Is there a schematic regarding the configuration of the belts? I am struggling a bit here...

Please check those images. Let me know if it helps.

I think so. It makes sense to me now. I probably had the idlers with and without the teeth mixed. I'll give it another try in a couple of days.

Thanks for all your great work!

If I am not mistaken, this design requires four Z-axis steppers? If so, how do you power all four steppers from a single driver?

I am also looking at using $3 CNC shield with 4 drivers to have 1 driver per stepper.

You must be reading my mind! I was just looking at this!


It would work great if it could just split a single input to its four drivers without the use of an Arduino, but I am not sure if it is going to be that simple.

I am not really worried about running four drivers in parallel with the "base" printer size, the torque should be more than enough for them to lift the gantry. I plan on building a large version of the printer though, so boosting the current isn't such a bad idea...

PS. These are the obvious solution for me because I am using an MKS Gen L board but I am neither fond of having four extra boards nor I am sure if these will work for people with RAMPS boards.


It works!!!!! How to connect 4 Z motors to Ramps or any other 3D printer board using CNC shield: https://youtu.be/yXGDJvERfHo :)

Awesome! I just ordered a CNC shield.

Would you be able to post or show the pin configuration? You are using the Step/Direction pins bridged all together, I presume?

You may connect all motors in series, or have 2 parallel pairs in series. Both work.