Auto bed-level for Ultimaker 2 with original Head

prusaprinters

<p>This solution uses a really cheap touch sensor for $0.13 as bed level sensor integrated on the free hole of the second Nozzle.</p> <p>I'll had some calibration "issues" with my Ultimaker 2 extended (clone). I'd had to repeat the calibration procedure every 1-2 Weeks. It was pretty annoying for me.</p> <p>The generic sensors are pretty big and will result in loose of print space. Most of them are even to big to mount them inside the printing head.</p> <p>As I'd like to have a reliable system i switched to Repetier Firmware which caused to loose the display, SD-Slot and rotary knob on the bottom, which i just used for bed calibration :). As i remember the original Ultimaker 2 Marlin firmware source does not support bed leveling or is at least broken.</p> <p>I'll modified the firmware as like the sensor is turned on just before the auto bed leveling is started with G29. The Ultimaker 2 printing bed is on the bottom of the printer. The sensor will calibrate itself in air when it is turned on so i had no problems when starting the system in an unknown state.</p> <p>Please don't use this sensor as reference for homing! The switching distance is just around ~2mm! I'm using the (mechanical) Z MAX sensor for homing ans Z MIN for bed leveling.</p> <p>AliExpress: <a href="https://www.aliexpress.com/wholesale?SearchText=HAILANGNIAO+TTP223&amp;SortType=price_asc">HAILANGNIAO TTP223</a></p> <p>Video: <a href="https://youtu.be/dveu7bqsJZU">YouTube</a></p> <p>My Z_PROBE_Z_OFFSET is -2.2mm.</p> <p>Pins i Used:</p> <blockquote> <p>#define ORIG_Z_MIN_PIN 17</p> </blockquote> <blockquote> <p>#define ORIG_Z_TOUCH_PROBE_PWR 16</p> </blockquote> <p>.</p> <p>.</p> <p>.</p> <p>I've changed in commands.cpp:</p> <p>case 29: {</p> <p>// START Xylen.C4 re-power Touch Sensor</p> <p>pinMode(ORIG_Z_TOUCH_PROBE_PWR, OUTPUT);</p> <p>digitalWrite(ORIG_Z_TOUCH_PROBE_PWR, HIGH);</p> <p>// END Xylen.C4 re-power Touch Sensor</p> <p>Printer::prepareForProbing();</p> <p>.</p> <p>.</p> <p>.</p> <p>// START Xylen.C4 turn off Touch Sensor</p> <p>digitalWrite(ORIG_Z_TOUCH_PROBE_PWR, LOW);</p> <p>// END Xylen.C4 turn off Touch Sensor</p> <p>}</p> <p>break;</p> <p>case 30: {</p> Category: 3D Printer Accessories