Piston Ring Alignment tool
thingiverse
This tool is designed to align the piston ring perpendicular to the engine's bore when checking the ring's end gap. It is possible to use an old piston for this step, but I think that this was a lot easier to use. There are two versions available. The first version has a stub diameter of 105mm that I used when file fitting the rings in my engine build. Designing out the stub's honeycomb was fairly involved, so this version was included because of that. The second version is much more simplified, and has a stub diameter of 100mm without any text. This version can be used for any bore diameter just by scaling the X & Y axes in your slicer to the diameter that you need.
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