Anycubic i3 Mega partfan monstrosity

thingiverse

Boxy, but good enough. Includes a part effectively remixed from https://www.thingiverse.com/thing:2479809. Borrows dimensions between fixing bolts from https://www.thingiverse.com/thing:2457516. This is an attempt to get partfan coverage from both sides while retaining the original plate mount to the bearings. After several attempts, I gave up in disgust with the quest to design something elegant and settled for monstrous and temporary. I am a bit over trying to modify the mega's existing hotend, so this is simply a temporary means of getting better part cooling while printing components for an entirely different printer. I may eventually revise this later, but it will likely be in a version that completely replaces the mega's hotend compartment right back to the X carriage bearings. It's not pretty, and despite having a COD LED inside it to illuminate the nozzle, it's almost impossible to see underneath the ducts anyway, and the LED really needs a trimpot to turn the light down a little. So consider the COB LED slot completely optional. I also soldered the connections to it so they exit towards the LEDs' light-emitting surface, so the slots I allowed for wiring to exit may not be big enough for your standard lazily soldered fat blobs of solder and a wire direction change... maybe, maybe not. The top bolt on the partfan doesn't fit due to an oversight, so mine runs with it missing. LED COB 26x16mm has a heatsink stuck to its metal side: Heatsink 14x14x6mm (7x1mm vanes, typically sold in combination with an even smaller one for use on raspberry pi) The partfan outlets just click in, helps if you put the short end that's closest to the actual partfan in first and then force the further edge in last. No supports, bridging sucks a bit on the partfan outlets, but it doesn't create enough surface roughness to pull the airflow onto the heatsink, so it's okay. You could try separating them from the other parts, flipping them, use supports, and make the airflow surface nice and smooth by printing it as the top face. But I didn't bother. The partfan is a 5015 blower; some are stronger than others. I picked the strongest one I had. The heatsink fan is still the stock 4010. None of the nuts require a print-pause, but it is designed for square M3 nuts... which you may not have. Gluing in a hex nut would also work. I use glue to lightly tack several of them in just to make assembly easier. PLA, 0.4mm nozzle, 20% infill... pretty standard (not really important) 1.2mm walls (*IS important*; or your bridging will suck and all the basic design assumptions are for that thickness). It's annoyingly close to the print, and ugly... but it is a slight partfan improvement.