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If you need some knobs on your kid's kitchen, then just print these models. They can turn them, and the knobs have even a ratch inside.

As seen in the first picture: 

-Drill a 7 mm hole

-Screw the ratch to the panel with the bushing inside the drilled hole

-From the backside: Put a washer onto a 3mm Screw, guide it through the bushing and screw it into the knob

The parts are designed to fit on a IKEA Duktig kitchen, if the wood of your kitchen is thicker or thinner, then you have to scale the bushing. The attached model is 18,6 mm long.

I printed the knob and the bushing in ABS, the ratched in PETG. Supports are required on the knob.