double use fan, for Orca v0.2

thingiverse

This project involves utilizing a single 60x60 fan for dual purposes, i.e., cooling the hotend extruder area and directing airflow to prevent warping on small printed pieces at high speeds. A flow diverter activated by a lever allows you to choose between these two functions. When sending air to the piece in print, a microswitch (salvaged from an old mouse) bypasses a 40Ω resistance, causing the fan to run at full speed. The design ensures directed airflow to areas needing cooling, unlike simple fans that cool indiscriminately. A comparison of two 10x10 cubes printed at 130 mm/s highlights this difference. As for assembly, print parts with good detail (no supports needed), use a slow speed and fan cooling for piece 05, attach components as detailed, drill a hole in piece 05, and finally connect wires and resistance as per the diagram to complete the setup.