Sturdy top mount spool holder

**Top mount spool holder for Robo 3D R1 and R1+**

Ground up redesign inspired by things [1773428](https://www.thingiverse.com/thing:1773428) and [158289](https://www.thingiverse.com/thing:158289). Wanted something that would hold the wheels a little more ridged and fit the shape of the R1 a little closer.

Can be used with my [spool enclosure design](https://www.thingiverse.com/thing:2849617) to make your printer look like a robot

**2018-01-21 Update**
Needed to print using a very smal