Under-shelf Dremel & chuck holder (with parametric model)

Print on its side, add some light supports under the floating parts. 
Prints pretty easy, I recommend using PETG or ABS, but PLA should be fine for light use. 
Infill can be low, 3-4 perimeters are recommended if using 0.4mm nozzle (2 is fine for 0.6mm w/PETG). 

Parametric Onshape model available here (open variable table and edit it to your liking). It may break if you adjust too much, but feel to copy and edit to your liking.