Automatic (semi) platform calibration checker
by eried, published
In almost a year using a 3d printer, I have learned that platform calibration is probably the most important factor to get nice prints.
This "method" uses a digital depth meter, a webcam, a macro, a spreadsheet app and a OCR application to get a matrix of the current heights in the platform. My adjustment will be based on a primitive approach (almost by hand).
1) Print http://www.thingiverse.com/thing:14174 (or similar) for your digital gauge
2) Set a webcam (or better link your meter via serial port) to look into the meter screen, in this case with http://www.webcamlaboratory.com is easy to do an OCR and get the data (too bad that app is now exclusive for Intel learning pcs)
3) Use the attached macro in Vtask (or use your prefered macro app, or better direct link with the printer via serial). The macro should do this: http://screencast.com/t/6SduKMZ5Q
4) Use the attached excel and replace your values. Of course the "stress" deformations per screw are very dumb values I guessed by hand, no 2D interpolation or something fancy (I am not sure yet how the platform bends, so it maybe much harder than I guess, but I just wanted a quick test to help me)
5) Rinse and repeat! until the flatness on your platform is TOO DAMN HIGH!
PS: In my excel graph, height is dramatized (all values are less than 0,3 mm, so my platform is quite flat)
Here is a video :)