Needed more cable trays, as IKEA only provided 2 pcs. with the package. Those are just alike. They are small and only fit 1 cable.

The flat tray to be added of course after cable has been inserted. Attach to wall with adhesive tape.

Flat tray goes very tight into the rounded one, but doing it a few times makes it work.

Length 125 mm. Width 10 mm Height 5.5 mm

Can be printed as it is, no need for supports etc. Did it on Ender 3 with 70 degrees bed temp.