Simple and Cheap Mountable Tupperware Drybox for Prusa XL

I couldn't find any simple dry box solutions that mounted to the Prusa XL and made use of the existing filament spool holders. By modifying this $12 Round Tupperware, you can have a simple and cheap dry box that mounts to the XL frame using the existing spool holder. 

The only cheap Tupperware I could find is not deep enough to accommodate the default XL spool holder, so this modification allows it all to fit. 
 

1. Purchase this round Tupperware (or any similar one of similar dimensions) and drill a small hole in the center of the Tupperware base for the spool holder screw to pass through. 
2. Drill a 2" hole in the center of the lid (this model is for a 2" hole which is large enough to accommodate the spool holder end cap. I used this hole saw. 
3. Unscrew your spool holder from the XL frame, and re-attach it so the Tupperware is between the spool holder and the frame. The OEM screws work if you press hard to get the screw to line up, but if needed you can use a 12mm M4 screw which is a bit longer. 
4. Pass the adapter through the lid from the inside and secure it in place with the nut.

Now you can add and remove your filament by simply peeling off the round lid. I used a silica packet in the bottom of the dry box and connected the drybox to the XL filament sensor using a piece of PTFE tubing, one of these Bowden Tube adapters,  and the PTFE adapter from this dry box project. 

If you position your spool holders carefully, you can fit 2 Tupperware dry boxes (one directly over the other) on each side of the frame. 

Print pieces at 100% in the orientation shown in the photos with supports on the adapter piece only. Can be printed at any layer height.