Primarily designed for 9 volt batteries, which are also known as PP3 or E-block.
Very fast printing in Vase Mode (called Spiralize Outer Contour in Cura).
While rewriting the code to suit non-cylinders, I realised that it could be used for almost anything, let me know in the comments what you use it for!
Note that the dimensions of 9v batteries actually allow a range, so print a 1x1 test first.
Width: 24.5mm - 26.5mm
Depth: 15.7mm - 17.5mm
The author remixed this model.