I wanted a box that could hold multiple spools and that I could easily put under my 3D-printer table. For me it was also important that all the spools could be replaced seperately, without the need to take all the spools out of the box.

The final solution is a box that was bought from IKEA (It's the Samla 57x39x28cm 45l version), where there are two threaded rods mounted in the box. On the threaded rods are then 10 bearing holders mounted. These holders support the different spools and make sure the spools spin nicely. The filament is feeded through 5 different ports. On the outside of these ports, it is possible to screw in an pneumatic coupler (PC4-M10). These ports are designed on an angle, this improves the feed trough when the box is below the printer. These ports can be mounted in any orientation, so that it faces the printer.

Below I'll list the needed parts to build this box. This example list is for a box that can hold 5 spools with a diameter of 20 cm and a width of 7,8 cm. But you can change the setup how you like. Just print more or less ports and bearingsliders. This setup can also be used on other Samla boxes.

Needed tools:

• screwing machine

Needed mechanical parts:

• 2 x M8x500 threaded rod
• 5 x PC4-M10 pneumatic fittings
• 15 x M5x10 Allen screw cylinder head
• 16 x M5x10 Allen screw countersunk
• 31 x M5 nuts
• 20 x 608 bearings

Needed 3D-printed parts:

• 10 x bearingholders (2/spool)
• 5 x Inside plate passthrough (1/spool)
• 5 x outside plate passthrough (1/spool)
• 4 x Rodholder CounterPlate
• 4 x Rodholder plate

Build steps:

• Print all the above meansiond parts.
• Measure and mark the needed holes in the box. (mounted like the example on the pictures)
• slide the needed amount of bearing holders over the two threaded rods
• Install the rod holder plates on the end of the rods and mount them in the box
• Install as many needed passthrough ports in the orientation needed for easily filament passthrough.
  If you have any questions, ask in the comments :)

Extra:

• The rods don't need to be measured accurately, they can be screwed more or less in the rod holders.
• To make the box airtight, I bought some doorsealer to glue in the box lid. In IKEA you can buy some clamps to close the box tightly. Or you can print them yourself (https://www.thingiverse.com/thing:1109316)

Future modifications:

• Adding a hygrometer
• Adding some clips to prevent the bearingsliders from sliding.

NOTE:
Be aware that with other boxes then the IKEA Samla, it is possible that angles passthrough won't be aligned perfectly because a different box walltickness