I made this, because I need to replace old i2 bar clamps without take apart almost whole printer... holes for m3 bolts - 3.12 mm holes for rods - 8.2 mm nutraps diameter - 6,55mm dimension: 30 x 26 x 26 mm need: (per clamp) 4 x M3 bolts - 30 mm long 4 x M3 nuts 4 x M3 washer When U need clamp adjusted for motor - U propably need only 3 x bolts, nuts and washers maybe it can be problem with nuttraps - i can print 3 mm hole with max error 0,1mm (2,9 mm) I added OpenScad source but it is mainly in my language - but I tried to make comments in english :) PS: sorry for my english :) printed in skeinforge, layer height - 0,3 Edge Width over Height - 1,6 Infill Solidity - 0,4 Feed / Flow rate - 30 / 30 no support