I've made this remix for two reasons: to pick up the P3Steel triangular design and to make the part easier to print - the sharper angles print much cleaner than the original hexagons.
I've also closed the back of the frame because with the open version the fan blows right over the back-end of the build plate, which may cause an additional warping risk for ABS parts.
The remix is based on the 81mm version for the A+ version of the GT2560. It should fit all other versions as well.
The frame doesn't need any supports at all. The lid needs supports from buildplate for the fan screw/clip recesses.
Printed in PLA. Supports are needed for the lid only. The frame prints fine without any supports.