The card holder has an inner area of 88x58x21.5mm (23-24mm inner height if there's no cap on), the walls are 1mm thick, with a 1mm chamfer at the bottom and top to allow stacking holders.

The cap has a lower and upper chamfer as well, the shape is extruded on the bottom to lock onto the holder (1.5mm).

The cap's upper chamfer has a chance to flatten out so maybe supports? You do you.

Print times:

Both: 2h9m (27,78g)

No cap: 1h17m (14,48g)

No holder: 52m (13,42g)