Hollow clock 2 - silent and smooth by shiura 3d model
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Hollow clock 2 - silent and smooth by shiura

Hollow clock 2 - silent and smooth by shiura

by Thingiverse
Last crawled date: 3 years, 1 month ago
Silent and smooth : stepper motor version of "Hollow Clock", https://www.thingiverse.com/thing:4747403
Easy operation : super-easy time adjustment
Easy print : printable without supports (except optional cover.stl)
Easy assembly : gears can be set by just sliding in
Cheap : used stepper motor is very popular and cheap (around 3USD with amp circuitry)
A bit smaller than original "Hollow clock" (rotor diameter : 200mm vs 160mm). Now it has no air gap between rotors.
Update Feb 24, 2021
Arduino code for stepper motor control is improved. Rotation is a bit smoother than before, with 8-phase control.
Update Mar 3, 2021
Cover for the rear parts (stepper motor, circuits) is added. It needs support to print.

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