Alright, found a 3D model of the Ikea 365+ 10.6L container that everyone uses as filament box. However, it did not have a modeled lid, wich was exactly what I wanted.

My measurements are close, BUT not super precise, so don't complaint when I share the model, when reality is you should NEVER design something tightfitting for plastic containers like this, without a real life reference.

Now that I have the lid, I can model what I want to do to turn this into a rael filament box.

Alright, modeled a pair of 1Kg spools from my go-to filament brand and set them up inside the container, as high as possible (so there is space for the dessecant at the bottom) and to the rear, so the filament can have a softer path to go to the outlet (wherever I put it, still undecided).

Things I know I DON'T want:

Drilling on the container body. Ever tried drilling those things? The plastic will shatter like crazy and drills will grab and pull like a velociraptor, and that's made even worse because the sides are at an angle, and drilling both the same is a pain in the ass.

#3DPrinting

@Nixie cheap soldering iron is your friend :)

@Rajiv I got expensive soldering irons for that. XD

Jokes apart, I'll just leave the container as is, and do all the work on the lids, as they are much cheaper than the bodies, and flat.