Plastic House cereal box drybox solution

There are a few cereal drybox solutions out there, but I found them lacking for various reasons, mainly that the Jessie spools that I'm in the habit of using are too wide to fit. So I wanted to design something adjustable, and preferably without supports to make it easier to assemble.

[Update] NOTE: Printed Solid have disappointingly made their Jessie spools even wider and they don’t fit in the Plastic House box at all now. Most other spools should fit though.

I also made it all fit on a MK4 print bed, and print in less than 4 hours!

There are several parts:

• base — this sits at the bottom of the container and holds everything else (print upside down)
• rollers — the bearings snap onto these, you'll need 4 of them (print on flat side)
• left and right roller supports — the rollers screw onto these, you'll need 2 of each (print on flat side)
• crossbar — these brace the roller supports horizontally, you'll need 2 of them (print on flat side)
• hygrometer holder — holds a hygrometer to the base (optional) (print on front)
• hose connector — this holds the PTFE hose to the box, and has an M8 thread on it
• hose connector nut — this secures the hose connector to the box
• desiccant box — holds silica gel beads to keep the humidity down (optional)
• desiccant box lid — lid for above (optional) (print upside down)

You'll also need to buy some parts:

• Plastic House cereal boxes
• PTFE hose (4mm OD)
• 8x22x7mm bearings
• hygrometer (optional)

I've tried it in both PLA and PETG, both at 0.2mm layer height. For strength, you should increase the number of perimeters to 4.

Once printed assemble like so:

1. Drill an 8mm hole in the front of your cereal box, 50mm or so up from the bottom.
2. Push the hose connector in from the outside, and secure with the nut from the inside.
3. Pick up a left or right roller holder, and push the crossbar into the slot near the middle, from the opposite side from the thread. Push the opposite orientation of roller holder to the first onto the other side of the crossbar, again with the thread facing out.
4. Push bearings onto the rollers, all the way until you hear a click.
5. Carefully thread the rollers onto the threaded rods, taking care not to cross thread. Make sure the rollers are in the right place for the spool you intend to use.
6. Push the hygrometer into the holder from the front (side with the rim).
7. Push the hygrometer and holder into the slot in the base.
8. Place the assembly into the cereal box.
9. Fill the desiccant box with silica gel pellets and snap the lid into place.
10. Place the desiccant box into the box between the side rails of the base.
11. Cut a length of PTFE hose to the right length to get between your drybox and your printer, keeping in mind that the print head will move around.
12. Push the hose into the hose connector.
13. Get a spool of filament and push it through the PTFE hose from inside the box. Once it has reached the other end of pipe, rest the spool onto the rollers.
14. Seal up the box.
15. Print a cap for the end of the hose — I like this one.