This is a set of 4 button assemblies and a cap for the FDD connector of the EmuFDC cartridge produced by 8bits4ever:
The 3 buttons are printed together with the flat-based holder that needs to be attached to the cartridge's case with a thin 2-sided adhesive tape.
The assembly1.stl and assembly2.stl models have rather high buttons. In the assembly3.stl and assembly4.stl models the buttons are low-profile. The low profile buttons will be on the same level as the FDD connector's cap, so this makes the cartridge look better.
I am including the source of the models for your convenience.
Please be careful when removing the supports under the buttons. Don't twist the buttons too much or they will break away.