IBM 5150/5160/5170 Card Holder v.2 by LtCasual on Thingiverse: https://www.thingiverse.com/thing:6731156

Summary:
Remix of existing 5160 / 5170 card slot holder. Scaled it to accurate size, replaced spring clip style posts (which did not print well and would break off) with solid posts. Also adjusted thickness of the clip as the original seemed to put a lot of force on the card.Clip snaps into place with a friction fit, you could easily melt the posts slightly to make them semi permanent.Tested on a 5160, that's all I have for testing!