08-01-2021, 02:41 AM
I've got an original Elegoo Mars and I'm not sure whether the design has changed (suspecting not seeing as the initial set up appears to be unchanged) and ran across the same issue. When telling it to home it would hit the build plate and start grinding, took a look at the little peg at the rear and noticed it was getting nowhere near the sensor. So I took the build plate off and pressed home and saw that it was correctly doing the homing sequence which told me it was something to do with the build plate.
As some here have suggested the secret lays in the ball joint. This joint tilts in the x & y directions to allow for horizontal leveling but it is also on a spring in the z direction. The plate should be able to push in and spring back in the mounting bracket. If it isn't you may need to take it apart and check the spring, and make sure it has some light greasing. When homing and leveling the plate needs to be loose so it can push in and out.
The reason mine had started grinding out when homing was because the plate had pushed further out in the joint (likely due to me being heavy handed when removing the previous prints, plus i did drop the plate once).
As some here have suggested the secret lays in the ball joint. This joint tilts in the x & y directions to allow for horizontal leveling but it is also on a spring in the z direction. The plate should be able to push in and spring back in the mounting bracket. If it isn't you may need to take it apart and check the spring, and make sure it has some light greasing. When homing and leveling the plate needs to be loose so it can push in and out.
The reason mine had started grinding out when homing was because the plate had pushed further out in the joint (likely due to me being heavy handed when removing the previous prints, plus i did drop the plate once).