Hi everyone! This is my latest design, a high precision direct extruder using a planetary gearbox plus the big (12mm diameter) dual drive bondtech style gear-set.
Short spek:
Gear ratio - 7.5 (new option 7.2)
Filament pushing force for LDO-36STH17-1004AHG 17mm stepper ~7.7Kg (7.5 gearing ratio, based on measured motor torque characteristics. The actual motor torque is less at lower operating current and RPM than the nominal max torque rating of the stepper).
Filament acceleration up to 660mm/s^2
Retraction speed: 60mm/s
Overall weight is about 140g
Please do not run the LDO stepper above 500mA without proper cooling it can heat up too much and melt the SLS printed plastic gears
The orbiter printing @ 200mm/s on my MachCube 2.1:https://youtu.be/aZolOWtBbME
In the last months I have experimented with worm gear based extruders with very good results, however not perfect so I decided to go for a different approach.
What I have learned is that the worm gears are not the best choice for extruders. Although high gear…

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