Modified vertical for Universal Extrusion Spool Holder

This is a replacement of the vertical part of [Nerys](https://www.thingiverse.com/Nerys/about) great Universal Extrusion Spool Holder.

It fits with the [600g spools for Flahsforge printers](http://www.flashforge.com/product/0-6kg-pla-filament-black/) (in Swede sold by Clas Ohlson) and makes them usable with my Creality CR 10S.

I just use a nail as endstop. Not very elegant, but it works.