80mm chasis fan nozzle and Sunhokey Prusa i4 cooling

thingiverse

One more fan cover to direct airflow out of print bed. The holes and cover size are suit to standard 80mm fan. I use it to implement additional motherboard and chassis cooling of Sunhokey Prusa i4 printer to resolve stepper driver overheating problem. Complete solution includes: 1. Replacing tiny stepper driver chip heatsinks installed by default with bigger one 2. Installing a fan blowing inside printer directly to MKS board on a right acrylic plate of i4 chassis 3. Cutting out a grill in power supply chassis and reversing built-in fan direction so it exhausts hot air out of power supply 4. Cutting out a hole in i4 left acrylic chassis above power supply so power supply fan blows directly thru it 5. Covering chassis holes with a pair of fan nozzles to direct airflow out of print bed Result: I’ve monitor stepper drivers chip temperature and saw not more than 49C even under highest possible steppers load. BTW, my stepper driver reference voltage is set to 1.2V (MKS v1.5 board) SketchUp sources are attached as well. It contains two more designs August 8, 2017: Nozzle design cleanup, STL file for left nozzle added. February 3, 2018: Left nozzle v2 added. Suits better.