So I bought a new tube of chapstick and almost immediately somehow managed to lose the cap. What to do? Throw it away? It's just going to get gross in my pocket without a cap...

Wait a sec, I've got a 3d printer. Thingiverse, can you help? Indeed.

User mike_new already had a great design for this cap, but I didn't need the extra loop he added for hanging on a keychain. So I brought his design into Meshmixer and removed the loop, repaired the model, and printed it out. It fits great! Would have looked nicer in white rather than the black PLA I used but I was too lazy to change it for now.

Another useful 3d print in the bag!