A study of bed deformation while heating
I'm not aware of measurements of the bed leveling while its temperature change when heating.
I've done a first try. The data could be better presented. My bed is leveled by flat spring following that topic https://shop.prusa3d.com/forum/user-mods-octoprint-enclosures-nozzles--f65/fix-bed-variance-warp-using-flat-springs-t23693.html
I zipped images from a modified version of the "Prusa Mesh Leveling" octoprint plugin. I set the middle/left point to 0 and the middle/right point too. Other points are calculated according to that. The aim is to have a representation of the leveling independently of the difference of the hight of the left and right of the X axis that can change per exemple after a Z calibration. People may be interested in automate that, I saved all the files manually.
Files have timestamp in the filename. The heating started at ~22:26. The last three character give the approximate temperature of the bed during the bed leveling. B20 is a 20°C bed, B50 is a 50°C bed...
I find the first image strange but i can't giveaway strange data. The minimum variance is reached after heating during 20 minutes (0.048mm) and then stabilize around 0.060mm. The variance change quickly after stopping the heating.
I used to print large parts after heating for 15 minutes. That confirm my practice. The bad of the high leveling change due to the heat is if you measure your bed at time0 and your nozzle go on the measured point at time0+20minutes because it had to print half of the bed before, it won't be at the good height. If you do large parts, you have to wait for the bed shape to stabilize.