This hook is designed to hang your backpack to keep it out of the way. It uses a cantilever design to apply mostly compressive force to the print, allowing it to be printed in PLA without compromising strength. Despite taking only 16 grams of PLA filament and just under 40 minutes to print, It can still withstand considerable weight without deforming. I used #6x1/2" countersunk screws to secure mine to 5/8" MDF, but you can use any screw with a head under 7mm diameter. There is also a non-countersunk screw version.