Giá đỡ cuộn filament cho kệ 18 mm

Filament holder for 18 mm shelf.
Can grab shelf, but have also holes to fix by screws.
Metal part - leg - is from Castorama.

Because my shelf is not touch the wall (I have there c.a. 25 mm), so one of knob works as spacer. It has thread so you can screw/unscrew as bracket is vertical.
Secon knob has also thread because leg has originally also and that was easy to mount. reason to use this knob is to not fall out filament from support.

Propose use PETG.