40mm (4cm) 90° fan duct
thingiverse
Because I desperately required one. Print Settings Printer Brand: RepRap Printer: JG Aurora A3 Prusa I3 Rafts: Yes Supports: Doesn't Matter Resolution: .2mm Infill: 100% Notes: This is only two millimeters thick at its thickest point, so I did one hundred percent infill with a twelve-hundredths-inch top/bottom/shell thickness. It prints much faster that way. I didn't use any supports, but you might need to depending on your printer and the quality you're aiming for. I highly recommend using a brim or raft as there is very little touching the build plate.
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