The idea behind this is to mount a sensor + 2 40mm turbo fan without having to worry for dimensions, this is specifically designed for all the Makerbot Replicator 1 dual clone, that don't want to drop the second extruder, since it comes in handy with ditto printing, and want the cooling of the piece, for better look and aspect of the printed parts.
I remixed the thruit00 idea plus the backcooler "tiny" walls idea, but this time with thicker walls and a curved and separated fan design, as on the backcooler.
This was finally printed and it seems to be a success so far!
The main reason for this, anyway, happened after buying a bondtech dualdrive system, the system is really good but my https://www.thingiverse.com/thing:2933195 (Back cooler, rear mount) was made pretty useless, since the 10mm, used in the backcooler are all used by the frame and parts of the bondtech, that thought probably that nobody would use such a tiny space...
Please, mind that this system is still in the development phase, so changes might occur without advice.
for more information about a valid updated firmware that makes use of auto-leveling, and also autoleveling, plus more options, available also for boards with ATMEGA1280 (the majority of the unmodified boards), look here: https://www.thingiverse.com/thing:2918962
also, if you're using simplify3d, look at my release of gpx, compatible with simplify3d: https://github.com/uoitalia/GPX/releases
Spectrum Filaments PET-G
Supports only from platform!
Cooling FAN if present, not mandatory but helps: first 5 layers 30%, then 100%
Other settings as you usually do.