This is a travel dial holder, or carriage stop for a Chinese mini lathe. You can fit a DTI gauge as I have shown in the pictures, or an 8mm bar to act as a carriage stop. Useful when you have to make many of the same part, or when you need to turn a feature to an exact length.
I used an M4 button head screw to clamp the DTI, and made a knurled screw to clamp to the ways.
I've used this a couple of times already, don't know how I ever managed without...
Edit: I had to make a small modification, the V2 body now has a slot for a captive half-nut for the main clamping screw, threading into plastic is not the best idea when you want to clamp tight. You can still use the original model, ok if only using with a DTI, but if you want to use as a carriage stop then I suggest using V2.
Print the main body upside down ('v' upwards), print the clamp with the guide rails uppermost. I printed mine with PLA, printed perfectly first time.
Note, probably best to use a colour other than white!
Tap the upper hole M4, the lower hole M5.
V2, just slide an M5 half-nut into the slot, no need to tap the hole.
Fusion 360! What an incredible piece of software, just keeps getting better!
Ask if you want the design files...