The Whirlpool W10594481 (also sold as WPW10594481) is an Amazon best-seller because the originals crack at the D-bore. A printed replacement in PETG puts more plastic around the bore — the exact spot the OEM part fails.
Shaft fit: 6mm D-shaft (6.21 × 5.38mm bore). Knobulator lets you set the exact bore
shape and clearance, so the knob grips the shaft instead of spinning — the usual failure of
one-size-fits-all replacements.