Round dice (11.8mm) using a BB

thingiverse

Ensure there are no sharp edges for safety. Print twice with open sides down for optimal results. Insert a 4.5mm steel ball and apply instant glue carefully to join halves. Testing with index fingers might not be as fun as it seems. Customize the paint, writing or file modification with numbers included. Be aware that the thinnest part is 0.6mm which may not print well on certain settings; scaling up by 10% could improve results. Essentially, it's six spheres combined with a larger sphere, enclosed by another big one and then cut in half. A compliment to anyone who creates a parametric version!