Robo 3D R1+ Blower Fan Shroud

thingiverse

I liked and used the original, but I only had a single fan. I needed the fan on the other side as well. When I ordered more, I made the mistake of ordering a similar sized blower fan. A little reworking later and I had the shrouds I needed! One thing to be aware of, is that with 2 fans working together you get much more cooling than a single fan. And my blowers blew a lot more air than the original muffin fan. This cools the extruder as well as the part as the air bounces off of either the part or the bed. Using a later version of Marlin (1.1.9 in my cases) this produces a thermal runaway error as the heater is unable to compensate. I accommodated this by setting a max fan speed in the firmware that would be scaled accordingly. This is done in configuration_adv.h define FAN_MAX_PWM 100 // My value, 0-255 adjust for your fan