Prusa mini squashball back foot redo/fix

I'm a huge fan of this design. It really does quiet down the Mini, quite significantly. However, I was having issues with the back foot coming off every time the printer was moved. I.e. removing the print bed, inserting the memory stick, etc. This remix makes the back foot fit much more securely. After installing this fix, the back foot hasn't fallen off or shifted once. Printed at 0.2 layer height using PLA+ (because that's what was in my printer at the time), but would recommend PETG. Make sure the model is oriented with its side on the build plate before slicing/printing. No supports needed. After printing, simply slide over the back of the mini's CPU box and you're set!