This might be a silly remix, but I found it useful so it's getting uploaded :-P

This is a simple locking nut for the “Adjustable Height Support” (https://www.printables.com/model/920145-adjustable-height-support) designed by @happymaker.

In my case I wanted to lock the support at a specific height, so I added this simple locking nut to hold the support at a specific height even if I move/relocate the support.  

Also, I suppose it's possible for vibration or other side affects to unintentionally to change the height. The locking nut will prevent any unintentional changes to the height of the support.

Anyway…. 

This locking nut will hold the Adjustable Height Support at a specific height indefinitely.

There are 2 different version, one with nubs and one without.  It shouldn't take any special tools to secure the locking nut.  The plastic provides plenty of friction to secure the nut in place by hand.