Thanks for downloading!
We'd love to hear from you if the print was successful.
Modular Printhead - NEMA8 worm gear
Parts for my modular printhead tu build a direct extruder3D printer parts and enhancements
Creative Commons Attribution Share Alike
Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.
No BOM right now, here is why:
There are at least three obstacles to overcome, which requires some machinery.
Most worm gear sets with module 0.5 have drive worms with a 2 mm bore. It cannot be widened to the 4 mm of the stepper shaft as the overall diameter is too small. So you have to machine down the stepper shaft to 3 or 2 mm or manufacture a small adapter with a 4 mm bore and a 2 mm shaft.
The usual drive gears (MK8 ..) feature a 5 mm bore. This would require a 5 mm shaft, ball bearings with 5 mm ID and widening the worm gearwheel bore to 5mm ... parts would become quite bulky and heavy. I took a 3mm shaft and made a bushing with 3 mm ID and 5 mm OD for the drive gear.
The design offers not enough width for a drive gear with a set screw. I removed the half with the screw and glued the remaining part to the shaft.
You need at least:
NEMA8 stepper, a worm gear set 1:40 with module 0.5, a drive gear (MK8 etc), 2 ball bearings ID 3 mm for the gearbox, 1 ball bearing OD 10 mm for the pressure wheel, an idler arm spring, 2 pieces of a 3 mm shaft, 4 M2 screws for the stepper, a 4 mm bolt for the idler arm, and a hotend like Merlin, Prometheus, E3D ...
Settings on an UMO:
approx 3040 steps / e, eight step microstepping, retraction 0.4 mm @ 5 mm/s
Issues are used to track todos, bugs or requests. To get started, you could create an issue.