Filament Spool Holder for Railcore II

I loved the frame mount from this thingiverse project (https://www.thingiverse.com/thing:3017969) but I wanted a slightly different style of actual spool holder.

I revamped the mount a little bit, and added a threaded spool holder so it's easier to change the size of the actual spool spindle if you wish. I also added some holes where the spool holder mounts to the frame so that you can secure them down with some m3 bolts if you desire.