Prusa MK3 Filament Guide for External Spool Holder

I don't like the idea of 1kg filament spool mounted on the top of the frame (which is not that rigid to needlessly strap extra weight to it). I didn't find any design that would fit my needs, so I decided to make a new one. Perhaps it is a bit too complicated and big (adds 20+ cm to the printer height), but it gets the job done. :-)

The STL files are more than a year old and there might be some small mistakes (like front puley holder cover, which doesn't really fit). Or the front pulley itsel