These are for the flash forge creator pro to cover the handle holes on the side of the printer. They hold themselves in place with built in tab hooks.
I printed this on the Flash Forge Creator Pro using Hatchbox orange ABS. Layer height .2mm, extruder temp 235, bed temp of 110c, active cooling, glass bed with kapton. I found it prints just fine with no support or rafts. Sliced in Makerbot desktop. I would recommend giving the tabs a quick wipe with acetone to strengthen them if you plan on taking them out alot.
Flip the orientation obviously.