@Tsatogua
Malheureusement la M3D est un peu particulière (surtout les moteurs qui sont des 28BYJ-48 ou y ressemble fortement , qui est connus pour sont backlash ) .. J'ai trouvé un lien : https://printm3d.com/community/viewtopic.php?t=1272&sid=85a95e284b00bccfa67f1280185e1cf6
" This is the result of the backlash correction.
In the expert screens there is a preprocessor settings button that you can adjust up and down the backlash. "
" I spent about 4 hours one afternoon last week calibrating the backlash to solve this exact problem. Here's a good thread on it: http://printm3d.com/portal/forum/index#/discussion/493/test-print-to-see-what-s-up-with-circles
I didn't do anything too scientific...I'd change the values, print a sample circle, look at it, repeat. And I am thrilled that I can now print circles, gears that work, moving parts, etc. Here's my process. "