Other Issues:Assumes an unusual material so I had to change a bunch of settings for ABS. More importantly the 1/4 20 bolts? What on earth does that mean????!!!!! What you need are M4 x 12mm bolts and some nuts. Ignore the guidelines. Also 2 walls?? eh? 6 walls with 40% infill is far more suitable for a handle that you want to use to NOT drop and damage your expensive cover with; I had to replace mine for 50USD. Otherwise great design. Thanks.