The keychains are 35mm in diameter and 3mm thick, with the glyph and surrounding border 1mm thick. (15 layers @0.2, with glyph & border being 5 layers)

The hole at the top of keyring is 4mm in diameter, which should be plenty for a keychain or to attach it to something like an ID lanyard or zipper on a bag.

Because the glyphs sit entirely above the base, no MMU system is needed to use a different colour for them, and you can simply insert an M600 on the layer they start printing on.

The Kijetesantakalu glyph used on this Keychain was designed by James Flear, sourced from here, licensed CC-BY-4.0.
The Toki Pona glyph used on this keychain was drawn by myself within fusion360, feel free to make use of it however you want.

My Print Settings:

• Layerheight: 0.2mm
• Extrusion Width (Perimeters): 0.35mm
• Perimeters: 3
• Top/Bottom Layers: 3
• No Raft/Brim Necessary
• Any colourful enough material