magic spring (Slinky)

THERE IS NO STL(except when i'm waiting for updates to take effect, and have not deleted the stl again(thingiverse refuses updates without a recognized file format))
I wrote a java program that outputs directly to gcode.
to customize:
update 2022:
spring22.jar, recommended settings to start:
inner radius, 30 is a good starting point.
outer radius, larger than inner radius, preferably by 4-6mm.
layer height, I recommend starting with 1, or 0.8
zigzag per nozel, start with 2, larger number