After overbending my thumb (Doctor thinks it was dislocated for a second, and some ligaments are damaged), i had to somehow stop it from doing the same movement again.

After printing in PLA, you can heat the splint in boiling water and press it on the outside of your thumb. Then attach it to your hand with the loops on the small lobes (use string, or a band, i used velcro strips i had lying around)

My doctor approved of the splint, and it was useful to remould it, once the swelling went down.