Faster printing, customisable tool holder

This is a tool holder that's identical in function to this one:
https://www.thingiverse.com/thing:1994745
Which is a remix of this:
https://www.thingiverse.com/thing:872507

This piece will print much faster, and it can be customised. Keep reading for complete details and some tips for maximising print speed.

I like the function of the models upon which this was based. I like it so much, in fact, that I have printed at least a half-dozen of them. However, I was getting tired of waiting for the wonky floor shape (was that generated randomly, or is there a reason for it?) to print. It creates thousands of superfluous massive velocity changes, which can literally add hours to every print job.

I redesigned the floor to use rational shapes that are mostly curves that align with the angles of the cylinders. All sharp angles are inside-acute, so print defects due to high speeds will disappear inside of the model. This reduces infill to nearly zero and simultaneously eliminates supe