I've been working on a combo part cooler and BL Touch mount, which I'm currently working on in OnShape here:
It's still very much a work in progress. I'm currently trying to get through an ABS print of the cooler part without blowing a fuse in the printer. Seriously irritating, but that's in another thread.
There are three main parts:
1. Carriage attachment. This attaches to the back side of the carriage by replacing the 40mm bolts with 45mm bolts. You'll also need to add the X Offset piece as well, otherwise you'll crash the part into the y axis cable chain when homing X. The slot on the side is for the BLTouch attachment.
Part cooler. This bolts onto the carriage holder. I haven't found a final design on this that I like, but I think the one I've got now is pretty close.
BLTouch attachment. Useful if you have a BLTouch.
To attach things together, I use heat-set M3 inserts available on Amazon here:
The fan I'm using is here:
As I said up top, I'm very much in progress on these parts, and plan to do a full write-up on them (including BLTouch) when I'm done. However, if anyone wants to improve on what I've done, feel free!