I needed a threading dial for my Emco Maximat Super 11 metal lathe but they are very hard to come by so I decided to design and print one.
My machine is the imperial version so I only needed a single 16 tooth gear instead of the 3 gear version on the metric machines. I found some dimensions online which helped get a rough idea and then 2 prototypes and I had a working version.
Ive used this for a few threading operations now and it works as it should tracking screw position.
I printed this on an Up! Plus 2 with all 3 pieces orientated along the Z axis to keep the shaft and shaft holes as accurate as possible.
I used 0.15mm layers with a 75% fill for the body and 95% fill for the gear/shaft combo and dial.