Robo E3 Calibration

Tap "Tools"

Tap "Setting"

Tap "Calibration"

To calibrate the initial distance between extruder and platform. After homing completed, slide a piece of paper continuously back and forth between the nozzle and the build plate and simultaneously manually tap up and down arrow to adjust the distance until the paper causes a slight friction. 

Up arrow: Extruder will elevate, away from the platform;

Down arrow: Extruder will descend, move close to the platform;

Tap OK to complete calibration.

Too high:

 Too low:

Perfect ✔: 

This video walks you through it:

If after calibrating, you are still experiencing issues where your print isn't sticking to the build plate, try the following troubleshooting steps:

Try adding a "raft" to your print settings to increase build adhesion.

If it is still not sticking, you may need to replace your build surface, add some glue, or take a little bit of sandpaper to the surface to help rough it up for better adhesion.