If you have a Beast Man action figure from the 1980s and his arm band nubs have snapped off, you can print out these nubs as a replacement. Works pretty good.
Break off the bottom tab after printing, then file down a little bit. Glue the part down using the surface furthest away from the nub. I spray-painted the two parts with Rust-oleum Regal Red before use. I glued using a 24-hour curing epoxy.
Used these settings with Slic3r and an Ender 3 printer. Of course, it depends on what printer you're using.