FilamentGuide Z-Topper for side mounted spools

This is a filament guide Z-Topper designed for the Prusa MK3 to be used with side-mounted spools. This little easy to print topper snaps into place on one of the Z-axis top mounts without interfering with the Z homing moves in contrast to the other filament guides I could find.  The top of the filament guide contains an opening that allows inserting and removing the filament without unloading it from the extruder. The twisted cut prevents the filament from accidentally slipping out by itself. It's easy to print without supports and no noteworthy overhangs. It should be printable in about 25 minutes.