I didn't like the fan placement or the spool holder on the Troodon 2 pro.  My printer takes up the entire width of my desk and wouldn't have ease of access to change spools.  So i changed the location of the fan a made a  filament runout sensor mount.  I used mostly extra hardware from the troodon kit, but you will need some extras if you make it like mine.  I used two m3 brass threaded inserts for the filament sensor and two m3x16 screws.  Also it mounts the the fan cover and you will need to change out the m3 screws that are there,  I used two m3x12 screws I had. If you modify it you will be able to use extra m3 screws from the kit. Printed on the Troodon 2 Pro.