Neva Brick Spool Mount

Neva comes without a spool holder and you are expected to print one yourself. I used the [Dagoma-designed spool holder](https://www.thingiverse.com/thing:2365668) to hold a spool at the top of my Neva. Dagoma's design works really well but there were a few annoying things that I decided to solve by making my own spool holder from scratch. Here are the goals that I pursued:

- **Neva-tailored shape** (spool holder should maximally make use of Neva's dimensions);
- **Secure installation** (the holder should not partially grip the bar or bend, or wobble);
- **Slim Profile** (the spool holder should be minimal in size, so you can mount it close to the wagon rails and reduce the angle that the filament creates while entering the extruder);
- **Minimal friction with the spool** (the spool-holding arm should be maximally round, so the spool will easily glide on top of it);
- **Support of multiple spools sizes** (up to 10cm in width and 1kg in weight).

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