Free Piston Ring Squaring Tool

[Spatt]

I've been making and using these for a while and just adjust the sizes depending on the motor I'm working on.  If they get damaged no biggie just toss it and print another one.  They are also pretty durable in PETG but YMMV.

Thought it might help someone vs having to use an old piston or worse yet just eyeballing it and skewing your measurements.

STL and .SLDPRT are up there for printing or modification.

Info is up in my blog where to find the files.