Made this about 4 years ago when I sprained a finger. Kinda forgot about it until I needed it again recently. I borrowed elements from user millenium's excellent finger splint, but for a full finger with a natural bent, thinner, and with a cutout so that I could still click a mouse.

Printed in PLA at .20mm using a brim. The brim is a must because I made it fairly thin. The infill doesn't matter because it's all walls. For different size fingers, just resize in your slicer. My glove size is small to medium so take that into consideration in resizing.