Single piece pulley / planetary gearbox NEMA 17 stepper mount and belt tension system
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Cam action gearbox mount that tensions the belt when rotated by the lever
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- Printables
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- Physics & Astronomy
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- Creative Commons — Attribution — Share Alike
This 3D printed part holds a Stepper Online 100:1 Planetary Gearbox Nema 17 Stepper Motor 17HS15-1584S-MG100 in a 2.5" hole cut into the side of my Dobsonian Rockerbox.
Because the stepper gearbox is mounted off-axis, you can tension the belt by turning the lever 90 degrees, allowing you to easily install/remove the belt and the optical tube assembly. It acts as both a motor mount and adjustable belt tension system in a single part. It only needs 4x M4 SHCS to mount the gearbox. Full build details with all parts here: https://www.summet.com/blog/2026/10/12/upgrading-a-dobsonian-push-to-rockerbox-telescope-to-automated-goto-and-tracking-control-with-onstepx/