Universal Spool Stand Bigger Wheels

I loved the idea of the spool stand rather than having to fix the spool on something involving screws, extra printed parts to fix on the spool etc. But the stand printed poorly on my setup for various reasons:

- the parts didn't fit as the cylinders were too thick,
- the wheels constantly touched the sides which causes jams,
- the wheels were small and unless putting a lot of work on smoothing them (with no guarantee about them being balanced etc as I don't have a lathe at home...),
- the toes were small, which caused the whole stand to move during printing, even with extra rubber legs,
- the filament sometimes scratched the sides and got jammed once in one wheel, because it has no guide.

So I decided to improve the original model:

- redesign the holes and cylinders that fit in them, and adding an extra space to make sure the wheels would never go to the sides,
- make the wheels larger, which implies that imperfections matter much less,
- create proper full-length toes,