Buy yourself some PTFE tubing and some PC4-M10 connectors to neatly channel your filament through it for wall mounted filament.
I bought this set, but you can use any PC4-m10 connectors.
The author remixed this model.
It has a bigger hole to put your filament through. The connectors have rounded edges themself and not all printers are able to accurately print a small hole to get the filament through.