This set includes several models, 3 screw adjusted clamps types that allows attach different kind of guides for the filament. Also the lock used to attach the guides can be secured using a piece of 1.75mm filament. The clamps body have two attaching point for guides, one on top and other in the back side. Additionally there are two types of fixed guides, of 1 and two toroid rings, and two that uses bearings, one rect and another angled.
I have an Ender 2 Pro that is a tiny machine, but with the filament spool holder uses more desk area than a Ender 3, so I'm using these guides to remove the filament spool from the top of desk. In that process I went changing the type of guide/clamp according the positions of the spool and printer.
The models requires minimal support to be printed (only the bearings guide hooks) but using snug type it's really minimal.
I printed them with PLA at 0.2 with 0.4 nozzle.
The author hasn't provided the model origin yet.