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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Use the BOM and files on the flexMendel (http://www.thingiverse.com/thi... page. I will put all the extruder files in a separate folder later this evening. The part numbers for the gears have changed slightly, and the printed parts have changed as well.
Great to meet you and see your work on display at the RepFest, I am printing the parts now to make my own low mass extruder. When I checked with Misumi they showed the gears you call out to be discontinued and the CS did not have a direct replacement. Have you ran into this also ?
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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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