In case anyone wants to print their own stickers, here is the SVG file with A4 size that I used. Because I have no clue, the printer told me that I had used RGB and they had to translate it to CMYK. So there is that. 
You need to tell the printer that they need to cat in the two rings with dotted lines that each knob has.
I went for https://www.typographus.de and the type of sticker I used was “TY107”. It is great but also expensive because you can’t run just one set with all the cutting. Especially if you have a printer, a dim light studio or don’t care too much about the polished finish, maybe a self-made alternative won’t be bad at all and you will save quite some money.