Zortrax M200 radial fan shroud for extruder heatsink

thingiverse

Important For a completely revised version, move here: https://www.thingiverse.com/thing:2797152 After some tests with the beautiful D6 blower fan upgrade by ZincBoy (http://www.thingiverse.com/thing:1666096) on my Zortrax M200, I decided to remix his design to better fit my printer. I think ZincBoy has tilted the fan for some reason, perhaps to improve airflow. But after a test with the blower positioned parallel to the heat sink, I did not detect any noticeable differences. I don't own the D6, but the original shroud doesn't fully exploit the cooling fins, so I increased the lower opening to expand the area hit by air flow. The radial fan to be used is the BFB0412HHA-A that you can order from digikey, mouser etc. The fan is locked in place with #3 wood screws. You need also a 12V regulator because the M200 sends a voltage spike which destroys the fan during startup and also because the operating voltage is beyond the specification of the BFB0412HHA-A. I've opted for the Pololu D24V5F12 (https://www.pololu.com/product/2846), a 12V/500mA switching step-down regulator well-known by fpv racing drones users. It's located between the shroud and the fan, in a dedicated housing. Its wiring shouldn't be a problem. Even with the step-down, the fan power supply isn't linear stabilized, so you need a capacitor on the step-down input to have steady 12V. See below for wiring. Print Settings Printer Brand: Zortrax Printer: Zortrax M200 Rafts: Yes Supports: No Resolution: 0.19 - 0.14 Infill: High Notes: Print as in the stl position, with Z-ABS, smart bridges enabled and 100% fan. Custom Section Comparison between the stock axial fan and the BFB0412HHA-A Stock fan Stock fan Centrifugal fan with shroud Centrifugal fan with shroud Capacitor wiring If you put a tiny 22uF/50V capacitor in parallel to the JST plug, the radial fan works at 12V cc, without the capacitor, something less. Here are some shots of capacitor wiring. Kapton tape Pay attention on the capacitor polarity. Important: close it all with a heat shrinkable tube. Step-down wiring