Expandable spool stand

I needed a place to store my set of Spool adapters that I designed so they weren't just laying around when they are not in the AMS, and I couldn't find any spool holders that I liked for what I needed. I designed this to hold my 250 gram spool adapters. However, since I designed those to be as wide as a standard 1kg spool, you should also be able to put many differant kinds of 1kg spools in this. If you want to check if your spools will fit before printing, the inside width of this spool stand is 69mm across. I wanted this design to be as versatile and expandable as possible, so I designed 1 spool holder piece and 2 different pin options: an end pin to make a nice smooth edge on whichever holder you want to be the end, and a connector pin to connect the spool stand pieces together. This allows you to make this spool stand for anywhere from 1 spool to as many as you want.you will need 2 connector pins in each slot, I made them half the height of the spool holder to make it easie