heatbed tests results for marlin G29 T command

thingiverse

After some troubles with printing large objects, I decided to test my Aluminium HeatBed - and what I see - it bended :( I use Marlin firmware https://github.com/MarlinFirmware/Marlin it has ability to use various probes for detection minimal z position, and best for my mind is an inductive detector LJ18A3-8-Z/BY after seeking I found G29 T parameter wich can show z points on heatbed it dumps to console like this vertices and finaly bed matrix sample rezult for command G29 T P4Bed Height Topography: (0,0) +0.45269 +0.28469 +0.24969 +0.21869 +0.23169 +0.08469 +0.03069 +0.03069 -0.14031 -0.18531 -0.13931 -0.08631 -0.28531 -0.29631 -0.27331 -0.17731 Bed Level Correction Matrix: +1.000000 +0.000000 -0.000466 +0.000002 +0.999993 +0.003821 +0.000466 -0.003821 +0.999993 You can insert your results to this code and check your heatbed I found another tool for visualizationhttp://www.maui-3d.com/cgi-bin/plotG29 https://people.sc.fsu.edu/~jburkardt/cpp_src/hermite_cubic/hermite_cubic.htmlhttps://people.sc.fsu.edu/~jburkardt/m_src/hermite_cubic/hermite_cubic.html