This is a remix of http://www.thingiverse.com/thing:1260597

This is for people who may not have any M6 hardware and are happy using the lower hole to mount the indicator. I have a good selection of M3 hardware.

There are now two versions, one that mostly uses TheRavenMaker’s design, and another that incorporates changes suggested by MKSA.

Version 1:
This remix is TheRavenMaker’s design with posts to accommodate M3 screws.

For this version you need to print one of these and one of TheRavenMaker’s.

Version 2:
As noted above, this version incorporates the changes suggested by MKSA where there is no firm grip of the bar, only the weight of the indicator is holding it in place, and only at 3 points. This is designed for an 8mm upper and lower bar. Two points make contact with the upper bar, and one point to keep it vertical with the lower bar.
The prints for this version start with "MKSA" and you need to print an A and a B version. The A version contains the posts.

Hardware: (2) M3 x 20 screws, (2) M3 nuts, (4) M3 washers.

Ream out the 3.2 and 6mm holes after printing. I would also suggest applying a very small mount of lube to the posts so that they come apart easily.

I’m using it on an Anet A8. The rail spacing doesn’t appear to be the same as the TheRavenMaker’s Wanhao Duplicator, but it works fine.

See wecapp's article and video to see the mount in use: https://meinelektronikhobby.blogspot.de/2017/03/gemessen-und-fur-gut-befunden.html

Update: After using both versions for a while, version 1, the one that grips the bar, performs better in terms of repeatability and general use. Version 2 moves too much, it has to be reseated when you move the bed back and forth.

The indicator I'm using: https://www.aliexpress.com/item/10-0-01mm-Precision-Tool-Great-Micrometer-Measuring-Gauging-Tools-Round-Dial-Indicator-Gauge-Vertical-Contact/32607193924.html?spm=2114.13010608.0.0.Ie616R