Raspberry Pi 4 50mm fan case

Raspberry Pi 4 B snap fit case for a standard 50x10mm fan. Why 50mm? They are more quiet than 30mm units and still produce a nice cooling breeze if you take a 5V unit and power it from the 3.3V internal supply. Assembly: brake away the support beam holding the fan bracket before inserting the fan. Caution: Be careful not to short the GPIO pins accidentally with a quick hack :-)