thingiverse
Print the front and back, and align and stick them together. A mounting peg works with a command strip to stick to a wall.
Total diameter is 170 mm. Works best with a clock mechanism with an 8 mm shaft diameter (5/16 in), 8 mm shaft length (5/16 in).
I used www.amazon.com/gp/product/B07T7HHJR2 for mine. The hands of the mechanism typically need to be cut to fit.
No supports needed, front took 6 hours, back + hook took 3.5 hours
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.