First of all, Shapr3D is a very amazing. Thanks for that.
I recently found something strange that happens sometimes when I want to replace a face to another face.
Here are the screenshots:
As you can see, the alignement is wrong and I must use another way to align the two faces shown on the screenshots (creation of a plan from the reference face, creation of a rectangular drawing and then, cutting the other object with the rectangular).
Thanks for your help.