Geeetech A10 Dual Fan Head Alternative

thingiverse

I came up with a dual cooling fan set up for the A10. I found some 12v 40mm box fans at a local store cheap so I went with those. Ive wired them in series as the output to the pwm fan is 24v. Note that I struggled to get the stock fan to run under pwm control - it was either on 100% or off - no control. A fine fellow named combat341 on the geeetech a10 forum figured out that you must activate the following comment in the firmware: #define FAN_SOFT_PWM...take off the backslashes to make it active. This is all it took for me to get pwm control. I designed the head so that it is made of components. As such, there are mounting holes you can use to adapt your own tangential blowers or other attachments if you dont like the size of the swing arm box fans and ducts. You can also remix or create your own 40mm fan ducts as long as you include holes to screw into (or glue them to the swing arms...could make them lighter and save some weight this way) This requires turning your hot end 90 degrees so that that the long end of the heater block faces toward machine so that the ducts and assembly is mirrored equally around the nozzle. I reused the stock aluminum threaded c-type mount rather than a clamp type mount to add an additional level of heat sinking. I may remix a clamp type also or feel free to do so. I used a variety of screw sizes to mount everything. The design is open to drilling out and tapping, drilling out and through bolting with nuts, or using thread cutting screws directly into the holes. Its up to you to determine what screws you want to use. I used #2 machine screws to mount the 10mm thick fans through the swing bracket into the duct holes - I let them self-tap and so far so good. I also did the same with the stock hot end cooling fan to mount to its bracket in front. I tapped #4 screw holes into the block in a few places to mount the brackets. Although close (1mm clearance or so), the left side fan and duct assembly clear the xaxis end stop mount plate. Note that the thickness of the hot end main body at the top pushes the tip down a couple mm - as such, you will likely have to adjust your bed/z axis endstop down a bit to compensate. I modeled dummy 10mm thick 40mm fans shown in white in the generic renderings. Sorry I dont pay much attention to how the .stls are oriented until I get to the slicer - will work on that going forward...maybe :O) Any comments or anything I forgot, let me know.