Upside down "PRAKI" cereal container dry box (version 2)

TL;DR

Print with 0.20 mm layer hight, 0.4 mm nozzle, no supports.

Printing version 2:

• 1x bottom frame, either with one or two connectors
• 1x inner frame (better choose a slow profile, it tends to warp due to low bed adhesion on front side)
• 1x dessicant bin cover
• 2x inner shaft
• 2x outer shaft
• 2x roll
• optional: 1x hygrometer holder for one insert, If you want to add a hygrometer or a label
• optional: 1x hygrometer holder for two insert, If you want to add a hygrometer and a label

“Upgrading” from version 1:

• If you only want to add a hygrometer to version 1, please have a look at the PRAKI Cereal Container Dry Box Hygrometer Remix by @Vincent.
• (only if you want to use/need the magnets) 1x bottom frame, either with one or two connectors
• 1x inner frame (better choose a slow profile, it tends to warp due to low bed adhesion on front side)
• optional: 1x hygrometer holder for one insert, If you want to add a hygrometer or a label
• optional: 1x hygrometer holder for two insert, If you want to add a hygrometer and a label

Full version

There are a lot of cool ideas regarding the “PRAKI” cereal container out there and I wanted to combine all the ideas I like.

The ideas I like

• Upside down: By removing the box, you have easy access to the spool, spool roller and dessicant box. Also I like it to have the wider side at the bottom.
• No drilling
• Self centering rolls
• No screws
• Dessicant box, which cannot open accidentally
• A second PTFE connector for the open end of the PTFE tube.

The result

Besides the spool roller with the dessicant box inside the container, there is a bottom frame outside the container. It is also a replacement for the lid. Due to the frame there is space for guiding the PTFE tube to the front of the container without drilling a hole for the PTFE tube connector.

What I added later

Version 1:

• Bottom frame version with only one PTFE connector.

Version 2:

• Supportless inner frame. Thanks to @Mike_2556531 for this great idea.
• Magnet holder for a 6x3mm round neodym magnet on bottom frame and inner frame. In case the bottom frame does not properly stay in place, a magnet can be pressed in each of the frames and the bottom frame is hold in place by the magnets. Thanks to @BrianSachs_484371 for this idea.
• Attachable hygrometer holder. The new supportless frame design offered the opportunity to design an attachable hygrometer holder. It comes in two versions. One offers space for a hygrometer and the second is higher, so a label can be placed there.

BOM

• 4x 608 bearings
• 2x PC4-M10 PTFE tube connector (1x when using the one connector version)
• PTFE tube
• 2x 6x3mm round neodym magnets (optional)
• A hygrometer like one of these (optional)

Printing

• Prints best with 0.20 mm layer hight, 0.4 mm nozzle.
• No supports needed
• Dessicant-cover must be printed with smaller side down
• Note the hints on the print files, if available.
• Roll, shafts and dessicant cover of version 1 can be used with version 2.

Misc

• If you want to add a hygrometer to version 1, please have a look at the PRAKI Cereal Container Dry Box Hygrometer Remix by @Vincent.
• Another nice addition is the Skadis shelf for upside down "PRAKI" cereal container dry box by @charno.

Changelog

• 2025-11-15: Fixed single tube bottom frame
• 2025-10-23: Added TL;DR
• 2025-10-22: Added version 2
• 2025-08-15: Added note for IKEA Skadis mount
• 2025-08-15: Added note for hygrometer remix
• 2025-04-12: Added a bottom frame version with only one PTFE connector.