Greg's Wade extruder for Prusa i3
by misan, published
Two things have been changed from regular Greg's, one is the motor location, that has been translated, and the whole thing has been elevated over the base so elements protruding to the back (towards the x-carriage) are now above it.
It fits the standard x-carriage of Prusa i3 (30 mm version, which is the latest).
Based on dviejo's mod.
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It is going to change depending on your hobbed bolt inner diameter, tooth shape, spring pressure and hotend. A value around 800 steps/mm (assuming your electronics is configured to 16x stepping) can be an starting value for your calibration.
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A pair of M3 bolts (30mm or longer) will be needed to fix the extruder to the x-carriage.
Video of an early version: youtu.be/E7ju4vxNtpI
I am using a pair of 50mm hex bolts, with springs and M4 nuts for providing the idler pressure.
I am told (thanks obijuan) that for 48mm body-long steppers you want to add 5mm to base_extra_depth value on the source to get additional clearance.
If you need extra clearance but you already printed the extruder, or if your x-carriage is 24mm instead of 30mm, you can use this part to fix any these problems: thingiverse.com/thing:81539
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