How do you straighten edges in blender?

How do you lay an object flat in blender?

If you want to rest your object precisely at 0 on the Z axis, just do the following:

1. Go to Edit Mode and then select the bottom-most point or face on your object, and then hit Shift + S to move Cursor to Selected.
2. Go to object mode and then hit Shift + Ctrl + Alt + C to set Origin to 3D Cursor.

How do you reset an object rotation in blender?

Parent object to the empty with Ctrl + P . Select empty and clear its rotation transforms ( Alt + R ).