3d printed knob protector for the Bernina 7 Series machines This will greatly help reduce the chances of breaking the stitch width or length knobs on your machines.
7 Series Knob protector fits: 710, 720, 735, 740, 750, 765, 770, 780, & 790. These machines all have Black Bobbins.
3d printed parts may have some imperfections.