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 http://www.thingiverse.com/thing:21480changelog:20140606 2231- increased the diameter of the middle hole a bit from 2.9 to 2.9520140607 0003- decreased it again to 2.925 but chamfered the bottom of the hole20140607 1753 - it's now 2.9 again - the chamfer solved the problem ;)