Biqu H2 35mm to 40mm Adapter Duct
thingiverse
Using this on my Voxelab Aquila which is an Ender 3 V2 clone but has a very slightly different X carriage although close enough to use Ender 3 V2 models with just a few holes drilled. My original H2 35mm fan died and since I only have 40mm fans and the BLTouch is in the way I made this adapter duct. Went through a few redesigns so it's got some lumps and flow isn't ideal anymore but it's close enough and I have spent too much time on it already. Maybe it'll help someone save some time as well.
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