Before using ABL, the printer must be homed. Please note that in most cases, the BLtouch has replaced the Z axis endstop as the means of the printer knowing when Z is approaching zero.
-The first time you home the printer, it is safest to start with the nozzle a long way above the bed. Then use your hand to trigger the probe in mid air. If there is a problem and the trigger doesn't work, this will give ou a chance to kill the power before a collision. Then consult the troublshooting section lower on the page.
+The first time you home the printer, it is safest to start with the nozzle a long way above the bed. Then use your hand to trigger the probe in mid air. If there is a problem and the trigger doesn't work, this will give you a chance to kill the power before a collision. Then consult the troublshooting section lower on the page.
After this, a G29 command will initiate the probing of the bed. Optionally saving to EEPROM will then store the probed mesh.
It is best to heat up the bed to printing temperatures before probing it. This is due to the bed surface expanding and/or warping when hot. We want to match the printing conditions as closely as possible.
We have two options on how we utilise the BLtouch: