Original Prusa i3 MK2/MK2S/MMU pinda probe cooler

The PINDA probe on the original PRUSA i3 MK2/S has an achilles heel: when it heats up, it detects the bed too early. (This will be remedied by the soon to be released PINDA 2 which actively compensates for the temperature of the probe).

This is particularly a problem when printing materials requiring a high bed temperature in an enclosure, especially if a print is aborted and restarted soon afterward.

This cooler helps with this issue by blowing unheated air from outside the enclosure ov