heatbed tests results for marlin G29 T command

thingiverse

After some issues with printing large objects, I decided to put my Aluminum HeatBed to the test - and what I see is a bent mess. I'm using Marlin firmware, which has the capability to utilize various probes for detecting the minimum z position. The inductive detector LJ18A3-8-Z/BY seems like the best option in my opinion. After doing some research, I found that G29 T parameter can display z points on the heatbed. When run, it dumps vertices and a bed matrix to the console, with a sample result from the 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 plug in your results into this code and check your heatbed. I also discovered another tool for visualization at http://www.maui-3d.com/cgi-bin/plotG29. Additionally, you may want to look at the following resources: https://people.sc.fsu.edu/~jburkardt/cpp_src/hermite_cubic/hermite_cubic.html and https://people.sc.fsu.edu/~jburkardt/m_src/hermite_cubic/hermite_cubic.html