Modular spool for filament samples

Edit: 2016-11-24
Added 150mm diameter parts. The threads and center are the same size as the 200mm.

I needed a spool for filament samples. With this design you can expand the spool as large as you want.

Inspired by http://www.thingiverse.com/thing:1764831, but I wanted to have a larger diameter spool.