Workbench Dremel Bit Storage

This is a remix of Dremel Bit Storage by MrRobot6502, thing 4166355.
When I tried to print the original on the Prusa MK3S, it curled so
badly that it lifted the magnetic sheet off the bed. But that problem
brought to light that there was a lot of wasted space below the upper
bit storage. So I ended up breaking it down the into six pieces and
added a couple of drawers in the back to use the space a bit more efficiently.

I also, as an afterthought printed 4 of the double wrench cradles to CA
glue on the back. I have several older, double ended wrenches that have
different sizes on each end and they didn't fit the slots in the original
design. Could have put them in the drawers but, what the heck. This way
gives easier access.

For the knobs, I used the knob out of the Sanding Tool by perinski, thing
3159240 which I was in the process of printing at the same time. Note
that I didn't put holes in the drawers for the 3mm screws to mount this
but, a drill took care