Ultimaker 2 e3D Radial Fan Mount
thingiverse
You'll want to print this model using a high-temperature material like ABS or PETG. It's also wise to line the inside of the shroud with aluminum tape or foil to reflect some of the heat back out. M2 screws are ideal for attaching radial fans, while standard e3d screws work well for the heatbreak fan. I sourced my radial fans from Aliexpress at https://www.aliexpress.com/item/5pcs-lot-Gdstime-DC-12V-3cm-30mm-x-10mm-Ball-Brushless-Cooling-Fan-Air-Blower-Blow/32844290749.html. I had requested 24v fans in the comments, and they happily obliged with that configuration.
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