Hello guys,After weeks of hard work I managed to install the Marlin 1.1.8 firmware on my RenRen3D, which had self-leveling problems, so I decided to install the BLtouch and further upgrades.Fixed these first difficulties now when I go to print the Gcode, which I tried to generate with Slic3r, Cura and Prusa Slicer, they all give the same result, that is, the first layers have a fluid movement while the following ones the extruder starts to "jump" voluntarily.Below I insert the video and some photos.
https://www.youtube.com/watch?v=B9Ap712Utrk
https://www.youtube.com/watch?v=p6_w8HGQfrg
Can the firmware be installed that I have to fix? or some settings of Cura or something else?Thank you guys.Greetings.Federico