Convert a Lock & Lock container (or any other container) into a filament spool box with bearings and temperature/humidity sensor for use while printing. To be mounted on any of the Filler holders.

Parametric source is here: https://github.com/thebgfan/3d-models/tree/main/spool-holder

Components to 3D print

• base.stl: Stationary base that sits outside the box and allows it to be mounted. E.g. for an Ender 3 using the stock metal holder plate, you can print the Filler bolt (FillerBraceCrealityBolt.stl) and nut (FillerBraceCrealityNut.stl).
• spacer.stl: Stationary spacer that sits inside the box, houses the nut and sits against the inner part of the bearing.
• spindle.stl: The rotating spindle, connected to the outer part of the bearing. You can put desiccant inside and add a cheap temperature/humidity sensor.

Parts needed

• 1 airtight food container, e.g. Lock & Lock 2.5 liters: https://www.amazon.com/dp/B00BUKKBTO
• 2 608ZZ ball bearings (8mm x 22mm x 7mm), e.g. https://www.amazon.com/dp/B092LGTD9P
• 1 M5 bolt of about 40mm length (excluding the head)
• 1 or 2 M5 nuts
• Some Bowden tubing to guide the filament in the box
• Hot glue to glue the Bowden tube
• (Optional) A flat piece of rubber to use for better isolation of the base
• (Optional) Desiccant for keeping humidity down
• (Optional) Circular temperature/humidity sensor, e.g. https://www.amazon.com/dp/B07GR67G1M

Build steps

1. Drill a 5mm hole in the center of the box
2. Assemble everything in the order (from outside-in): M5 bolt > base > rubber isolation > container wall > spacer > bearings > spindle > M5 nut(s)
3. (Optional) Add desiccant in the spindle hole
4. (Optional) Add temperature/humidity sensor
5. Drill a 4mm hole on the side of the box at a steep angle
6. Run Bowden tubing through the hole and use hot glue to secure it