Creating flat patterns from projections

[Matteo]

I am working on a Shapr 3D drawing, specifically related to 3D CAD design. The drawing you see represents the front and back of a chair’s backrest. It is made of flat

polyurethane, which is always processed into flat surfaces with a certain thickness. In this particular case, the flat figure resembles a trapezoid, with base A measuring 796 mm, base B measuring 360 mm, height measuring 576 mm, and a thickness of 30 mm.

However, when I create a 2D drawing, it does not reflect the development measurement of base A of 796 mm but rather that of the 2D view, which is 516 mm. I apologize for the convoluted wording, but I couldn’t find another way to explain it.

Therefore, I need to provide the foam fabricator with a 2D flat representation with the correct dimensions that should reflect the development of the curve.

How can I obtain the flat development of this figure with the correct dimensions?

Having the flat development of a figure is crucial in the manufacturing process.

Thank you for your assistance

[H_Daniel]

Hey @Matteo,
2D drawing views are projected from the 3D object, the 516mm dimension is correct as this is the distance between the edges.
The circumstance of the lower edge can not be represented in drawings, but you can use Note tool to annotate it. Please check my short video about it.
You would need sheet metal tool to unfold the backrest of your chair modell and create unfolded 2D drawings, but unfortunately this is not available yet in Shapr3D

[Matteo]

Molte grazie Daniel
Thanks a lot Daniel