This is a remix of the Volvo key head to make the key head a little larger, a little thicker, and to be able to fit the dimensions of a U-Haul truck key.

I recommend heating the end of the key with a lighter until warm and then jamming it in with needle nose pliers (be careful not to push too far or it will eject out the bottom of the keyring hole).

I printed it in PLA with a .4mm nozzle and .2mm layer height.