Filament Guide
thingiverse
As it turned out, I needed a filament guide. The search showed many good projects, among them Filament Guide v5" by DanTech and Filament Guide (608Z)" by damonadjinn. But I needed a mount on a cylindrical surface, so I additionally used the project Parametric Clamp" by pgreenland. I couldn't get the strength of the printed screws so I settled on M3 screws. Adjusted some dimensions a bit and added shortened arms. 608z_Wheel_40mm not changed, but added for convenience.
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With this file you will be able to print Filament Guide with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament Guide.