This is a rough copy of the TEAC slider knob as used in the early Model 3 mixers.

Its printed in PLA with a layer height of .08mm If your printer causes ghosting print with a very slow travel speed.

My printer, Flash-forge creator V3 did a good job with these settings.

Once printed in black, I inlaid a string of white filament into the groove and glued it in with super glue. The part is over sprayed with clear satin paint to complete the finish.

Its pretty close to the original but not perfect.