Based on a 0-1" Micrometer. Keychain hole on the end of the thimble.

I originally designed this with a red letter M pinched between the anvil
for my work crew of tradespeople, added a keychain and handed them out as a crew
Christmas present.

Printed the thimble in grey and the body/anvil in white, then painted
the body/anvil.

Use support for the body/anvil and print standing upright

20% infill.

This one was printed in ABS, let me know if you try it in PLA.