Troubleshooting Video Guides (Bed Leveling, Jams/Clogs)

http://community.robo3d.com/index.php?threads/read-me-my-robo-doesnt-auto-level-correctly-faq.4664/

 

I am going to add an observation I have just made. This is the result of having to replace the left switch on the X axis and then noticing a very pronounced difference in sound. The switch I used has a very distinct click when it is actuated, the Robo switch is nearly silent. When the X Carriage is on the right side of the bed the autolevel dance is nearly silent, when the head moves to the left side of the bed there is an audible click when doing the autolevel dance. In the middle the same click is heard. Inherent in the Robo designs and likely the reason for the two switches since they would level at different heights. This is a very strong reason for taking the time to perform the most accurate paper leveling you can do, near the four corners of the print bed. This is also the probable reason for many people experiencing one side of their prints squished just a bit more on one side than the other. Now that I know this I am going to replace the other Robo switch with a clicky one so I have audible feedback that the autolevel has done something.

 

In some respects this is a Marlin limitation in how it calculates the auto leveling. Without distinct Xmax/Xmin, Ymax/Ymin sensing you have to assume that one axis is close to flat to do the math. The approach Robo has taken with the two switches across the X is good, but two inputs (rather than two in series to a single input) would be better.

I am not willing to poke the Marlin Dev beast with that proposition...it works pretty well now with that one caveat.

 

@Marquis Johnson