RailCore2 5015 Cooler Modified

UPDATE: Added another fan carrier that's 5mm closer to the hot end, in case yours is too far away. Also added 2mm and 3mm spacers in case you need to move the fan down more. I've experimented with running without the nozzle; it's better for some things, worse for others.

This is a new, more direct cooler setup for the RailCore2 printer ( https://www.thingiverse.com/thing:2407174 ). In the standard RailCore250, it will cost ~6-10mm of X travel, but may not cost any x/y on the ZL versions; we'