Prusa Mk2 Mk2s Mk2.5 Mk3 Filament guide

I was fed up of my spool unrolling when my Z axis came to the top so designed the clip on filament guide. Most likely hundreds of others on here.. but I couldn't find one I liked.

Easy to use and print.. I've checked and this shouldn't affect the Z / X axis. Let me know what you think.