Filament Drybox Spindle Handles.

For other Prusa MMU stuff:
https://www.thingiverse.com/AbeFM/collections/abes-mmu2-stuff

Handle for filament box. Works with Sterilite 1932 20 qt airtight box. Available at Target for ~$8, Amazon ASIN B00H1PS2TS

You will need a little under 40 cm of 1-1/2" Schedule 40 PVC pipe. I got 10 feet and cut it to lengths. I used the handle as a guide to get the angle. These are fairly thin so while it's not hard you should use some care to make things go as smoothly as possible.

With this you