Up Box / Box+ Spool Extender

I have a Tiertime Up Box+ that I use almost exclusively for printing ABS models. It works extremely well for this task, without any failures or warping at all so far. Overall, I am really pleased with this printer, however there are a couple small details that needed improving.

The original Up Box was designed to use Tiertime's exclusive 500kg filament rolls. When they came out with the Up Box+, they made a larger spool cover that allowed the use of aftermarket 1000kg filament spools. They included a funky spool extension that was very detailed but not very functional. The other day it fell off behind my desk and I didn't feel like digging for it. Instead, I set out to make the improvement I always wanted but never had an excuse to make.

The main part file is a snap on spool extension for the Up Box+, that still allows the use of the oversized spool cover that came with the printer. I also made a snap in adapter to contain the spool when used with the older Up Box, witho