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Robo3D R2 40mm Extruder Fan Cooler

by CdRsKuLL Oct 18, 2018
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Thanks for the model, can't wait to try this out!

I'm compiling my own firmware, so could you confirm the settings for X_PROBE_OFFSET_FROM_EXTRUDER and Y_PROBE_OFFSET_FROM_EXTRUDER? From the details, and considering the original Robo values, I assume it's:


Is that right?

Hi Sgomes,

Yes, that's correct. You will also need to change the probe points a little I think on your version. I've actually gone back to #define AUTO_BED_LEVELING_BILINEAR because when I enabled UBL the G29 command failed to work (autolevel).. Not looked into it anymore being honest.

I've now also upgraded to the 1.1.9 Marlin, and changed the bed home point to the top rather than the bottom. This then needed all the wizards re-doing, which is done. Lots of changes so will need to do a full and proper write up really.

Also, I've only been running the fan at 50% (24v version). I found it was providing really good cooling and made it a lot quieter by reducing the speed. These settings are in the Configuration_adv is you want to do the same and are using the extruder 2 pin.

define E0_AUTO_FAN_PIN 9

define E1_AUTO_FAN_PIN 9

define E2_AUTO_FAN_PIN -1

define E3_AUTO_FAN_PIN -1

define E4_AUTO_FAN_PIN -1



define EXTRUDER_AUTO_FAN_SPEED 130 // <-- This is your speed setting between 1 - 255

Let me know how you get on.



Oh, and another thing :-)

I've set my PLA cooler now to run at 60%, when it was coming on at 100% it was causing far to much cooling and triggering a thermal fault. Everything I've printed so far at 60% cooling has been really good. Need to print a benchy yet to confirm.. lol So the loudest thing on my R2 now are the motors... next mod will be a new motherboard with some TMC2100 drivers. :-)

Woohoo, thanks so much, CdRsKuLL! :) I'll be working on the mod this weekend, and I'll probably end up replacing the Raspberry Pi software altogether. Robo's stuff is a bit too hacky and unstable for me.