I’m thinking of making a dry box for my printer, however I have some questions:

1. Will using PVC pipe as a “roller” (if that’s the right word) that I’ll place my filament spools on be good enough? Or do the spools need to go on something more concave? Maybe I can cut some grooves for the spools to sit in? I know there are dry boxes that use like holders that you screw in, but I want to limit the amount of holes in the box.

2. Does filament have to be spaced or can I put the spools in the box to where there is no gaps but they can still move freely?

3. Does it matter if I use M6 or M10 pneumatic couplers to feed the filmanet through or is it just personal preference?