This is a simple motor cooling design for 4040 fans. Before my stock motors at 1.5 amps easily reached 70-80 degree, with the cooling and the 4040 28 mm server fans at 40% they run at 30 degree.

Can be printed on Voron 0.1 with no supports. Designed with holes for heat set inserts.

PS: Parts on the pictures aren't the latest Version (holes instead of slots, no screws). Don't be surprised. :)