Summary

Yet another badge holder. It's the vanilla "RFID badge holder" design, but not as cool as https://www.thingiverse.com/thing:1869475 which prints with bed-up supports. Mine needs internal supports, which mean you should get real friendly with your slicer.

Having done that, the supports peel out and leave an awesome badge holder. It is roomier, letting me use both an RFID card and a second plastic identity card. The edges are nicely rounded, it comes off very smooth with no post-processing required.

edit: because I was curious, I made a version with 1mm overhang (similar to https://www.thingiverse.com/thing:1869475); it prints with support from the bed only, and does indeed help with support removal, and leaves a pretty clean print. Finished product is not quite as tidy (because slightly more of the badge is under the edge now) but it is definitely easier to clean up.