The center hole is 8mm in diameter,

the clock mechanism you can find on Amazon or AliExpress, Temu,..

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Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
PLA BambuLab Basic Black Transmission Distance: 0.8
PLA BambuLab Matte Dark Matte Dark Red Transmission Distance: 1.6
PLA BambuLab Basic Yellow Transmission Distance: 4
PLA BambuLab Matte Desert Tan Transmission Distance: 2.4

Swap Instructions:
Start with Black
At layer #13 (1.12mm) swap to Matte Dark Matte Dark Red
At layer #21 (1.76mm) swap to Yellow
At layer #26 (2.16mm) swap to Matte Desert Tan for the rest.