A Geometric Coaster !

FreeCAD files are available in the tab "Thing Files".

If you don't have a 3D printer, you can buy this piece on the folowing site (In french but delivery charge free) : https://locorico.fr/categorie-produit/dessous_de_verre/

My other pieces for coasters : . A rabbit coaster, https://www.thingiverse.com/thing:3435873 . A rhinoceros coaster, https://www.thingiverse.com/thing:3433559 . A squirrel coaster, https://www.thingiverse.com/thing:3438516 . A monkey coaster, https://www.thingiverse.com/thing:3430097 . A geometric coaster, https://www.thingiverse.com/thing:3402215 . A star coaster, https://www.thingiverse.com/thing:3401249 . A triangle coaster, https://www.thingiverse.com/thing:3400961 . A deer coaster, https://www.thingiverse.com/thing:3394257 . A wolf coaster, https://www.thingiverse.com/thing:3399792 . A pingouin coaster, https://www.thingiverse.com/thing:3399809 . A owl coaster, https://www.thingiverse.com/thing:3394654 . Finger coin for complot game, https://www.thingiverse.com/thing:3394203