I read great things about this fan duct and wanted to use it on my Anycubic I3 Mega.
Incidentally, Pablogk95 had remixed it for use with his modular carriage, so I ended up printing his remix from here: https://www.thingiverse.com/thing:2893200
But still, big cudos to the original designer.
Printed in PETG at 245C with a big brim. Even on the amazing Anycubic bed, PETG warps at the corners but a big brim takes care of it. I think I used 10mm of brim.
I printed it without supports.