I simplified things so the right thing happens when you uncomment each part for printing by default now.

Also got rid of a bunch of stray numbers making up for more math I didn't do right.  Source has been updated.

Now, I want to change it all again, but I'm resisting the urge for now.

I think I could implement having the cover tape spool to be a 'drop in from the top' sort of deal.  Having it be how it is once these are all mounted would be rather inconvenient.