@tinken When you say nearly identical, does that mean I can use MK3 profile without worry, on MH website it says Smoothie needs a different method of creating a profile, but there's no link or other references, on FB group somebody mentioned it is not straight forward and needs special settings?
select the 2 objects
on the axis you want to adjust
select the right alignment
type in an offset to the amount you would like to move the part in by
you can now click on the subtract object and select the internal part you want to remove