Makergear M2 Cooling Duct for 5015 Fan / Blower
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Makergear M2 cooling duct using a 5015 blower
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This is a duct for the Makergear M2 that has much better cooling behind the nozzle compared to the original fan. It is designed for a Delta 5015 blower (BUB0524HHB) but may work with other 5015 fans.
It is mounted using the touch probe hole using a M3 x 16 screw, M3 lock nut, and washer. To mount the blower I used an M4 x 20 coupler/extension and a M4 x 25 screw.
The Rambo board uses PWM on the 24V fan supply to control speed which did not work to control the blower speed. I added a 50V 100nF capacitor across the fan connector (see picture) to get fan speed control to work as it cools very fast on 100%. Please note that this will not be a linear speed control but can still be adjusted as needed.
Since the left duct must be very close to the nozzle to work with the original endstop it should be printed with a filament with high heat resistance (I originally used PETG but it partially melted). The V4 nozzle must be rotated towards the front of the printer as shown in the pictures.