Auto bed-level for Ultimaker 2 with original Head
thingiverse
This solution utilizes a very affordable touch sensor for $0.13 as bed level sensor integrated into the free hole of the second nozzle. I experienced some calibration issues with my Ultimaker 2 extended (clone). I had to repeat the calibration procedure every 1-2 weeks, which was quite frustrating for me. The generic sensors are relatively large and will result in a loss of print space. Most of them are even too big to mount inside the printing head. As I wanted a reliable system, I switched to Repetier Firmware, but this caused the loss of display, SD-Slot, and rotary knob on the bottom, which I just used for bed calibration. As I recall, the original Ultimaker 2 Marlin firmware source does not support bed leveling or is at least broken. I modified the firmware so that the sensor is turned on just before the auto bed leveling starts with G29. The Ultimaker 2 printing bed is located at the bottom of the printer. The sensor will calibrate itself in air when it is turned on, so I had no problems starting the system in an unknown state. Please do not use this sensor as a reference for homing! The switching distance is just around ~2mm. I'm using the mechanical Z MAX sensor for homing and Z MIN for bed leveling. AliExpress: [HAILANGNIAO TTP223](https://www.aliexpress.com/wholesale?SearchText=HAILANGNIAO+TTP223&SortType=price_asc) Video: [YouTube](https://youtu.be/dveu7bqsJZU) My Z_PROBE_Z_OFFSET is -2.2mm. Pins I used: #define ORIG_Z_MIN_PIN 17 #define ORIG_Z_TOUCH_PROBE_PWR 16 I changed in commands.cpp: case 29: { // START Xylen.C4 re-power Touch Sensor pinMode(ORIG_Z_TOUCH_PROBE_PWR, OUTPUT); digitalWrite(ORIG_Z_TOUCH_PROBE_PWR, HIGH); // END Xylen.C4 re-power Touch Sensor Printer::prepareForProbing(); ... ... ... // START Xylen.C4 turn off Touch Sensor digitalWrite(ORIG_Z_TOUCH_PROBE_PWR, LOW); // END Xylen.C4 turn off Touch Sensor } break; case 30: { ...
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