Alien Z Probe auto deploy and retract

thingiverse

Human: An auto bed levelling probe boasting significantly greater accuracy than conventional microswitched probes. The probe incorporates an automatic deployment and retraction mechanism, which is spring-free, resulting in decreased effector load. We have consistently obtained sub 50-micron readings using this probe. Requires: 1 x 175mm by 1.5mm Tig welder electrode (any type will suffice) http://www.rapidwelding.com/dynamic/DisplayItem.aspx?c=ThoriatedTungsten&zl=1 1 x 1.6mm CK Standard 3 Series collet body http://www.rapidwelding.com/dynamic/DisplayItem.aspx?c=CK-3CB116&zl=3 1 x 1.6mm CK Standard Collet, 3 Series http://www.rapidwelding.com/dynamic/DisplayItem.aspx?c=CK-3C116&zl=3 1x 10mm od, 4.3mm id washer or similar, 1mm thick (mine is a Meccano One) 1 x Small neodymium magnet 1 x 3mm x 12mm caphead 1 x 2.5mm x 12mm caphead 1 x 3mm x 80mm rod (I used Meccano again) 2 x thin wires 1 x Set of printed parts Refer to the YouTube video for assembly: https://www.youtube.com/watch?v=SWFJIXH6jFM Also, a video of it in use: https://www.youtube.com/watch?v=DuBtdkLYIj0 Remember to attach a small magnet to the top of the rotating arm (top deploy arm) and half a small washer to the top left side of the Terminal Contactor Plug. The welder rod will require cutting off at the correct length for your printer; the Kossel Mini needed 20mm removed. The 1.6mm CK standard collet may need adjusting so the rod slides freely. The collet can be moved up and down in the collet body to adjust the probe for your printer. Setup: (For Kossel Mini) Set in Configuration.h #define Z_PROBE_OFFSET (0, 24.0, -2.08, 0) Set in Marlin_main.cpp void deploy_z_probe() { feedrate = homing_feedrate[X_AXIS]; destination[X_AXIS] = 0; // T3P3 Kossel Mini R2 destination[Y_AXIS] = 67; // T3P3 Kossel Mini R2 destination[Z_AXIS] = 22; prepare_move_raw(); feedrate = homing_feedrate[X_AXIS]/10; destination[X_AXIS] = -23; // T3P3 Kossel Mini prepare_move_raw(); st_synchronize(); } void retract_z_probe() { feedrate = homing_feedrate[Z_AXIS]; destination[Z_AXIS] = current_position[Z_AXIS] + 40; // T3P3 Kossel Mini R2 prepare_move_raw(); destination[X_AXIS] = -40; destination[Y_AXIS] = 60; destination[Z_AXIS] = 40; prepare_move_raw(); // Move the nozzle below the print surface to push the probe up. feedrate = homing_feedrate[Z_AXIS]/10; destination[Z_AXIS] = current_position[Z_AXIS] - 35; prepare_move_raw(); feedrate = homing_feedrate[Z_AXIS]; destination[Z_AXIS] = current_position[Z_AXIS] + 30; prepare_move_raw(); st_synchronize();