new-spool dry box

All the other filament dry boxes that I looked at weren't quite scratching my itch, mainly my itch to be cheap, so obviously i had to make one myself.

I wanted one that

* is cheap to print
* handles spool rewind for my mmu2s
* doesn't need me to order loads of other parts (i already had the rollers from the prusa mmu2s trays and the bag from my prusament which is most of the parts)
* fits on my desk
* has a window so i could see how much filament was left

looks mainly made of actual trash, does rewind really work on this piece of junk?
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The reason the ptfe loops around is to offer some slack for rewind. it will tend to expand at the point where the two tubes meet in the bag, pushing the two ptfe parts away from each other to take up the slack rather than unrolling much on the spool itself, which seems to offer just enough slack to avoid tangles. I plan on trying an extra loop around of ptfe to see if that means the spool itself is touched even less than