Jan 2019 Brake piston rotating compression tool.
Ok, so honestly there is already a cheaply made Chineeze tool around here for the task.
However today's blustery start triggered a desire to stay in and create/print something...anything.
You are looking at the resulting design (Cubify Invent) intended to fit a 32mm oil filter socket.
This will probably never be used on the Hyundai for which it fits....
But then the real goal was to design and make a functional object, which IMHO was accomplished.