Low mass gearExtruder
by dkennell, published
This is a robust, low mass extruder for 1.75 mm filament. It can be mounted to a vertical x axis with 70 mm spacing or can be mounted to a horizontal axis using the hot end mounting bolts. It is for the MakerGear hot end with the standard mounting pattern. The shaft is really milled rather than hobbed, which gives a much better "bite". It uses steel gears from Misumi which give a 5/1 gear ratio. The aluminum mounting plate acts as a heat sink, so fan cooling is unnecessary.
This extruder/carriage is about 1/2 the weight of the original on the Aluminum Mendel, allowing for faster prints and smoother operation.
Some weight comparisons to common extruders:
gearExtruder - 311g (11 oz)
Wade extruder - 549g (19.3 oz)
MakerGear 5 /1 - 457g (16.2 oz)
Minebea PG35L w/fan - 178g (6.3oz)
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I still use 12 V for my electronics, but the trend looks to be to 24 V. Either should work as long as it matches your DC power supply.
MakerGear offers the hot end in 12V and 24V do you recall which you used? hopefully I did not over look this somewhere. Thank you for posting your designs dkennell!
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I recommend setting the retraction length to .5 mm and the retraction speed to 15 mm/s in Slic3r to avoid skipping steps on filament retraction at high print speeds.
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