A quick'n'dirty mod of the Mark34 X carriage to add a 30mm fan for cooling the hotend.

I haven't actually printed with this yet, so use at your own peril! :-)

Please note that I'm using a replacement hotend -- so check if yours is long enough for the fan before you start.

Please start by checking if there is at least 33mm from the bottom of your existing carriage down to the nozzle before dismantling it. If not, you might be able to alter the bracket so it starts a bit higher up instead...

wozekX-A.STL is the original unmodified carriage from jelwek.pl, designed by Mateusz Brodowski.

The OpenSCAD file imports and modifies the original carriage STL and generates the ones with the bracket if you need to modify it.
full-fan-bracket.stl stops the airflow in the middle to prevent cooling of the heater itself. top-mounting-only.stl doesn't. At this time, i am unable to say which works best.