A lightweight extruder using a BMG + a 70g LDO Nema14 motor with integrated 10T pinion. Printed parts total 4g. Total weight of Derpa + Nema 14 Motor + BMG is 140g. A BMG + 25mm pancake is approx 220g.
The 10 tooth pinion on the LDO motor along with the BMG gear gives a 5.1:1 gear ratio, which is enough to push 14mm^3/s through an e3dv6 with 0.4mm nozzle. It should be able to push more through a Volcano.
Uses this 70g LDO Nema14 motor
Note, you may have to file off a super tiny bit of the lower ear as it can interfere with the screw holding the BMG together.
STEP and Fusion 360 archive provided.
- Qty 1 BMG
- Qty 1 LDO Nema 14 Motor
- Qty 1 M3x35 SHCS
- Qty 2 M3x45 SHCS
- Qty 1 M3x6 SHCS
- Qty 4 M3x? Screws to mount.
M906 E300 ; 300 mA current (try 350)
M92 E703 ; steps/mm
M201 E100 ; Accel, Not tuned
M203 E1800 ; Max Speed
M566 E1000 ; 1000 RRF InstantDv
bartolomeus has made an excellent remix of Derpa for the Sovol SV01 printer. His approach uses a ring which attaches the motor to a BMG. The BMG face mounts to the rest of the toolhead. It could easily be adapted to a number of other printers.