Bowden Extruder for Nema 17 w. Planetary Gearbox

by robkar, published

Bowden Extruder for Nema 17 w. Planetary Gearbox by robkar Jul 13, 2015
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My extruder design for my delta printer build. I'm using a Nema 17 stepper motor with a 5.1 planetary gearbox, which works really well. No skipping steps, no grinding filament!

In addition to the motor it uses a MK7 hobbed gear, two 10x3x4 mm bearings, four M3 screws, a M4 screw, a M4 nut, aM4 bowden coupling and a 10-15mm spring.

I had to print a washer and put it onto the gearbox in order to fit everything nicely, you might not need it. The bottom part is used to attach the extruder to aluminum extrusions (or something else!), and the knob can be used to manually extrude filament.

Here is a link to the complete printer: http://www.thingiverse.com/thing:923830

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Does the motor sit tightly in the bracket? or should I glue the motor? thanks

The motor does not need to sit tightly in the bracket, it is just enough. You don't have to use any glue!

Hello Robin,

i have a similar Nema with PG 5, a MK7 and would like to ask you how many e-steps / mm filament you are using.
I have actual 475 written in my eeprom and it works well....


Sep 29, 2015 - Modified Sep 29, 2015
robkar - in reply to Backinblack81

I have 439.5 steps/mm! I can recommend calibrating the extruder according to e.g. http://www.instructables.com/id/How-to-calibrate-the-Extruder-on-your-3d-Printer/?ALLSTEPS or http://www.dummies.com/how-to/content/how-to-calibrate-the-extruder-distance-on-your-3d-.html. That's how I came up with my number, and it seems to work fine!