ultimate first layer calibration patterns —

Founded ultimate first layer calibration patterns models & stl files for printing
Different shape test
Rocket printer
Retracton Test
thenerdyreview
Retraction Cubes
MatterHackers
Test dice
mino1970
Retraction Tower
Fab3DLab
Gap Test
Sp0ng3b0b
Printertes2
bbinnard
Mandala
valand70