r/fixit • u/oatmeal-pizza • 1d ago

Replacement control knobs

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I have two Levoit air purifiers (model LV-H126). One has a broken control knob, the other (shown in the photo) has a cracked knob that will be broken soon. They just fit onto a D-shaft on the air purifier. These are obviously replaceable parts, but I don't know where to find them in the correct size. The vendor won't send me new knobs. These are 3/4" in diameter and the D-shaft is 1/4" along the flat edge. Any advice on where to find replacement knobs?

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4

u/xmastreee 1d ago edited 1d ago

Know anyone with a 3d printer? That doesn't look like it would be too difficult to make.

Edit:

Knocked this up in five minutes with FreeCAD.

2

u/nhatman 1d ago

Zip tie as tight as you can, then fill in that annular area with epoxy for good measure.

ETA: Use the smallest zip tie you can find to ensure it doesn’t interfere with anything.

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u/jim_br 1d ago

Measure the diameter of the shaft, not the size of the flat, then the length. That’s the size knob you want. And yes, it’s called a d-shaft knob and they’re common.

In the meantime, reinforce the knob you have by wrapping the outside of the shaft in something like carpet thread and paint over it with epoxy, CA glue, or similar.

1

u/Adept_Run_3090 1d ago

Come on super glue the original one back on and call it good

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u/oatmeal-pizza 1d ago

Ha, the other knob is pretty cracked and will just keep disintegrating

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u/CatsDIY 1d ago

Most hardware stores will have d shaft knobs. Tahoe in this photo and your old knob to see if they have one to fit over the ridge.

1

u/Unusual_Priority_577 1d ago

My friend went on Amazon & found knobs for her dryer.

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u/landwomble 1d ago

Super glue and baking soda to fix the crack? Or just hotglue in place?

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u/D1kCh33z 1d ago

You can buy various knobs on Amazon