Easily printable GT2 pulley
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A GT2 pulley that can be quickly and easily printed with a 0.4mm nozzle.
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Updated at source:
Model information
- Source
- Printables
- Category
- Other Printer Parts & Upgrades
- License
- Creative Commons — Public Domain
I started printing pulleys from FreeCAD's gear workbench, but they never came out good on my K1 Max, so I looked for alternatives. Eventually found https://www.thingiverse.com/thing:3049582 pulley, but it did not have a 20T, 80T, step file, or other way of modification. I then created my own based off the gear workbench's output and tried it out. Turns out doing straight lines and a deep cut works perfectly. I then wrote an OpenSCAD module to parametrically generate meshes of the pulleys.
The model is all straight lines because FDM printing generally rounds out angles a bit, so any curved surfaces are created with the nozzle.
If you are going to SLA/SLS print a pulley, use the proper geometry for it and not this. This is designed for FDM printing where small features are very challenging to obtain.
I have included a sample 80T and 20T pulley profile. I also included the OpenSCAD file to generate custom pulleys and a screenshot of the FreeCAD sketch.
Print settings
0.4mm nozzle, default extrusion width
0.15mm layers
3+ walls
30%+ infill
Inner/Outer/Inner and precise wall in Orca Slicer
120mm/s @7800mm/s^2 speed and acceleration was used, but anything lower will work and likely higher too
I used Polymaker's PolySonic PLA PRO, but have not done any testing on actual wear. I have only printed to verify the profile shape works properly.