V-Core 3.1 - Chamber Heating Fan - Strain Relief Mount - 4020 blower fan
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I had a spare 4020 blower fan sitting around, so I mounted it to the bed strain relief and holy crap it works well.
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UPDATE: Made a v2 to give 2mm more clearance at the bottom of the chamber. Will prevent the fan touching the bottom motor mount during homing when the bed is at the max height.
Pretty self-explanatory. Pick the model that matches the M3 heat set inserts you have on hand (4.6mm OD, similar to the ones that Rat Rig specifies, or the cheap/common 5mm OD heat set insert). Print. Remove the old bed cable strain relief. Press in heat set inserts. Mount 4020 fan. Route cables, set up Klipper for the fan, and enjoy this surprisingly effective, surprisingly simple fan mount. In my experience, I can get a 300mm RR V-Core 3.1 chamber from 15C to 60C in less than 30 minutes with the 24V 4020 I just randomly had off hand.