This is not simply a gravity mount with oversized holes but rather a press on holder that holds the shafts of these screwdrivers with friction so they won't fall out when it's thrown into a drawer. It's made very specifically for this Craftsman set of jewelers screwdrivers that can be found here: http://www.sears.com/craftsman-6-pc-screwdriver-set-jewelers/p-00941106000P?prdNo=33&blockNo=33&blockType=G33 I use Slic3r and it makes holes smaller than they are in the design software so if you use another slicing program the holes may be too big. Other than that, nothing special needs to be done. I printed at .2mm layer height with a .35mm nozzles at 80mm/s with 20% infill and 3 perimeters, 3 layers top and bottom.