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Submitted by Dennis K. on Thu, 05/21/2020 Permalink

I think that is now the 3rd brew of Marlin 1.1.9.x i use that supposedly supports the BLtouch on a vanilla Ender 3. Two were TH3D and now yours. They seem to have all the same issue on my machines.

Everything seems to run okay. It detects the Z height via the probe, so the probe is clearly working. But either if i run G28 from the gcode of the print or from the printer (with M420 S1 in the Gcode of the print, naturally) makes virtually no difference.

Because once i start my first calibration test print (a 1 layer thick 220x220mm X across the entire surface) it shows that it absolutely not follows any height map generated by the BLtouch probing. In one corner it almost drives the nozzle into the print bed and in another corner it does not adhere at all, while the center is almost afloat. And this is all after careful manual leveling, mind you.

I know my bed is warped and i know that my other printer's bed will get warped eventually. But it has no warping that exceeds 1 or 2 mm anywhere.



I asked in Facebook and in Discord groups and no one seems to know what plagues my printers. Both are Ender 3 Pros and except for the BLtouch and aluminum extruder assemblies are as stock as they come. No one was able to help me to resolve it yet.



Maybe you have an idea.

Thanks in advance.

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