12mm Smooth Knob for 6mm D-shaft

thingiverse

I bought a Yamaha SU700 sampler that was missing its knobs, so I needed some new ones. The replacements aren't identical to the originals, but they fit perfectly, work great, and look acceptable too. To get them printed correctly, facing right side up is essential; otherwise, you might need to make adjustments due to differences in your printer's output.