Modular filament spool holder.
Print the tower twice since you need one on each side, and I printed the rod standing up with a brim of 5mm. The rod has M6 threads in each end, so if you want to secure it from falling out you can print yourself covers to screw on.
The base model has 4xØ11 holes on the bottom for anti slip feets. I printed my own in TPU.
The author hasn't provided the model origin yet.