The 'Geeetech A10' produces great results straight out of the box but some areas can be improved. In particular 'part cooling' and the 'extruder'.
This design replaces the hot end heat sink mount with a printed alternative that provides better cooling for the heat sink, provides a mounting for the existing part cooling fan and optionally allows for mounting an additional part cooling fan.
The additional fan provides part cooling from both sides of the nozzle.
Assembly is pretty straight forward however the 'Bottom Clamp' is fiddly to fit. It could probably be left out but I am more confident with nozzle stability with it fitted.
The holes for M3 screws will accept M3 screws directly with some degree of force however I prefer to use a tap for a few turns to get things started. The M2 screws fit fairly easily.
A slot for a cable tie is provided - mid height on the left rear upright.
LED lights can be fitted using the 'Light Bar' which is super glued to the bottom front of the 'Body'. Logically the LEDs will connect in parallel with the heat sink cooling fan, however my heatsink cooling fan is 24V and suitable LEDs will be required. Note - contrary to some YouTube articles my part cooling fan is also 24V but as reported will only run at 100%.
The pressure arm in the extruder of my Geeetech A10 failed after only a few hours of operation so I took the opportunity to replace the whole extruder with a belt drive alternative that I was using on another printer - see https://www.thingiverse.com/thing:3179561 When one observes how slowly the extruder stepper turns in normal opperation it is clear that there must be a resolution issue and a geared or belt driven extruder must help.
04/10/2018 - Added alternative light bar.
19/10/2018 - Body.stl updated. Top lugs thickened and channels added for fan wiring. Used 2 12V fans in series for part cooling and 24V LED strip for lighting.
By un-commenting #define FAN_SOFT_PWM in configuration.h the fan speed can be controlled using PWM.
Nozzles are a loose fit to accommodate tolerances of part cooling fans. I simply use a general purpose adhesive to fix the nozzles to the fans.
10/12/2018 Revised the nozzle stl's to allow fixing with M2 fan screws.
The Body requires a semi circle of supports under the heatsink top mount.
The nozzles should be rotated (180 deg) so that the top of the 'fan insert' is on the bed and no supports are required.
The nozzles were printed with 0.1mm layer height. 0.2mm layer height was used for everything else, however 0.1mm can sensibly be used for smaller parts. 3 shells.