Hi,

thanks for comments guys. I know that exists several specialised programs for metal sheet design, but this link http://moi3d.com/forum/index.php?webtag=MOI&msg=4813.4 inspired me to use Flow command for unfold operation of bended simple objects inside MoI and results seems to me very good.

I've modelled simple shape:



then I used Flow command and all dimensions match to unfold planar segments:



Then I tried to unfold model in specialised program for CNC press machine. One DXF was created without any correction and second DXF with correction which correspond to used press tool and metal sheet material and thickness. Correction ensure to get right dimension after bending (in this sample it's 27 mm). DXF comparison is here:



Because it's possible to calculate unfold length of planar shape including correction factor in advance, therefore I've tried to use Flow > Stretch with calculated line as a target curve.
After unfolding the overall length is correct, but length of segments are different:



therefore I'm interested in how it's complicated to add additional feature into Flow command - "Stretch radius only".

I can do it manually of course, but additional checkbox is more elegant and result is quicker.

Unfortunately I'm not programmer.

Mik