Picture of Printed Shower Knob

The shower knob in our guest bathroom was spinning freely, so I needed to do something fast. 

I quickly came up with a design that will work using 123D software (free).  The design and print files are available at:

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Step 1:

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Life is not perfect.  The hole in my first knob was too small.

Step 2:

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Rather than redo my 30 minute design, I just "enlarged" the print to 119%.

Step 3:

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The hole worked, but I had left too much "shoulder" inside and the screw wouldn't fit.  I did a two minute design tweak and printed again.

Step 4:

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Put the knob on and screw it in.

Step 5:

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Because my knob is long and does not contain a "stop" to limit its travel, I wrote the word "off" at the top shutoff position.

Beauty and a "stop" are desirable upgrades for the knob, but this is functional, costs about one dollar, and is more socially acceptable than a pair of vice grip pliers.

As a follow up, I found a way to repair the old knob:
studleylee1 year ago
This is great !!!. I had the exact problem once and ended up filling the broken knobndle with automotive "Bondo" and letting it cure on the shaft. Still works after 9years.
MikeTheMaker (author)  studleylee1 year ago
I repaired my knob using a printed ring based on the idea I got after reading your comment. I did credit you with inspiring the repair ring.
Thanks! Its always good to bounce ideas around :-).
MikeTheMaker (author)  studleylee1 year ago
You should remove that knob, photograph it and write it up as an instructable. You could enter it in the "Fix It" contest and maybe win a 3D printer . .
MikeTheMaker (author)  studleylee1 year ago
That's a good cure! It gives me an idea--I wonder if I could print a custom size "ring" and hold the broken piece inside the original knob. I'm going to give it a try :)
Good job on ya! hard work paid off
MikeTheMaker (author)  ashtonkonon1 year ago
Good job on ya! hard work paid off