Coaster template

Set marble count, coaster size, edge clearance, and demon-core seat size/depth. Print a 1:1 plan for cutting and drilling, plus a section of the shallow spherical carve.

Gap from coaster rim to marble surface.

Full sphere size (only a shallow cap is carved).

Seat opening ⌀: 20.59 mm

Marble gap: 7.88 mm

Core clearance: 14.75 mm

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