Summary

I needed a tension rod for my bedroom window, and didn't have the money to buy one, but DID have a bunch of old filament lying around. Basically "source" is the first segment, and then print however many "cores" you need to add up to the full length, and screw them together. Should be noted:

1. The "core" segment is slightly longer than "source," BUT once screwed in it's the same length. Naturally the top threads on "core" will be inside another segment, so when calculating total length don't include those threads, do your math based on the height of "source."

2. I designed these at 5" per segment because I needed a total length of 35", so, one "source" and six "cores." If you need a different total length, I would NOT recommend scaling either part. The threads were tricky as hell to design right and if you scale these in any direction they almost definitely won't work. I would recommend instead that you open "source" in whatever editor you choose and just cut out the length you don't need. For example, if you need 40", these are multiples of 5, no problem, print one source and seven cores; if you need, like, 37.5", I would print seven cores and a source cut down (from the non-thread side) to 2.5".