1

Well… Just tried to adjust the height of an extruder before a print, while the extruder was on and hot (That was stupid on its own). But then I accidently slipped and my screwdriver went into the fan and snapped off 4 blades. Now it vibrates and makes lots of noise as well as not blowing much air. Then Stupid me went to get a new fan after taking the old one out and forgot where the old fan plugged into the board. If anyone has a wiring diagram or knows where to plug it in (the broken fan is on the right extruder) that would be very helpful

Thanks

2

The row of connectors at the opposite side to the stepper drivers has two labelled “EX1” and “EX2” - these are for the hotend fans.

3

Thanks, this helped a lot. I’ve got a spare fan and I was thinking about using it to blow air on the print while printing. I see an unused port on the board labeled ‘EXTRA’. Could this port be used to control another fan and would there be any software/firmware configuration required?

4

Yes is could, and it should. It will transform the usefulness of your printer.

You will probably need to solder a mosfet on though, often its missing from the board. And you will need a cooling fan duct.

I think the the most popular design is this one on thingiverse, which also includes detailed instructions on the mosfet mod.

5

As Slippyr4 has said if you want to add a cooling fan you need to solder a new mosfet on the board. I recently did this and made a video of the progress. CTC 3D Printer Active Cooling Mod - YouTube

Be warned as there is a risk of breaking the board when doing this mod.