My friend had a wifi card that only had a PCI Slot Cover for the card that would fit one of the slim PCI slots that you'd find on some servers or workstation PCs. He was using it in his system with a rig he made by drilling a hole in a quarter, which I thought was kinda janky.
So, i designed a replacement PCI slot cover that fit a full-size PCI slot. I based it off another existing design, which can be found here: https://www.printables.com/model/160015-pci-slot-cover/files
NOTE: This part was designed for a case in which I think the PCI slot was reverse orientation, but I can't remember. You may need to mirror the model before printing.
The author remixed this model.
Changed for a wifi card and designed for a slim PCI/half-height card.