Dial indicator clip for 30mm fan hot end (E3D V6, Chimera etc)

With a dial indicator obtained cheaply from ebay, you can easily level your printer bed relative to the hot end or measure and adjust the distance from the nozzle to the bed.
This mounts the indicator right on the fan so it can be moved around all over the bed without having to unclip it at all.
2 versions are here: one for mounting behind the fan and one for mounting in front of the fan. Which you use depends upon the hot end you are using and how much room there is. I use the back mount for