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'll test and find out.

The nozzle gets glued onto the blower, and the blower gets bolted to the carrier. The screw holes are undersized so an M3 should thread in, and I put a nylon lock nut on the top screw.

I've posted a couple of overhang tests; the one on the left was facing AWAY from the nozzle, the one on the right facing TOWARDS the nozzle. These print was at .2 layer height and 75mm/s. Unfortunately, I tossed the one I printed with the original cooler.

RailCore2 (https://www.thingiverse.com/thing:2407174 )

No

No

.2

50%

Check the preview on the nozzle. I adjusted my extrusion width in S3D until it was two passes with no gaps.