Mounting Plate for either a 40mm, 50mm, 60mm, or 70mm fan (with countersink) but optimized for a 60mm fan. It attaches to the electronics enclosure I designed here: http://www.thingiverse.com/thing:912068 It has grooves for #4-40 hex nuts which you can superglue or acteone/nail polish in place (may also work with M3 hex nuts). I plan to use this fan with the assembly: http://www.amazon.com/gp/product/B007PPES42?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00printed with .8mm nozzle at .6mm layer height at about 18mm/s in ABS. It took about 30min.