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umo mod: stable print table lock nut

I just created an stable version of the print table lock nut by ultimaker.
If you don't like the original one or have problems with the spring (like me) - print it!

Idea by

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- increased the diameter of the middle hole a bit from 2.9 to 2.95
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- decreased it again to 2.925 but chamfered the bottom of the hole
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- it's now 2.9 again - the chamfer solved the problem ;)

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