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Yeah this stuff can be a steep learning curb.
if you have autodesk inventor or fusion 360, you will find there are source files included for those that wish to mod the original.

I had issues with vibrations eroding cards (I drive an ex military vehicle with hard suspension) and wanted a firm fit to address that.

many people complained which is where the removal holes came from.
but I like close tolerances, and you will find that this is the #1 complaint about this design.

the best bit about printers like this is that you can alter the design or the scale to suit your needs.