UPDATE: 15-01-2020

More sizes added: 2,5-10-20-30-40mm filament opening.
These are designed with tapered end for easy assembly.
Made with a tight fit, to assemble you just press top/bottom part together

It consists of a top/bottom part in separate files, so be sure to use the right set of files

THE OLD DESIGN:
Yet another filament guide for IKEA LACK.
This one is made of two parts. The parts snap together inside the IKEA LACK. So no use of glue or screws.
Also it's designed to be smooth inside where the filament passes trough, for easy and quick pulling the filament trough the guide.

MOUNTING:
Tools i used to cut the slit in the Ikea Lack table was a drill and a knife.
First mark up the outer ends of the filament guide and drill holes in the table in both ends. After drilling you just cut out the rest with a knife