2D scale 3D

New to the forum, been using S3D for a few months. Great app… thanks to the S3D team great job.
Not sure if this has been covered? Have been importing 2D drawings and resizing to scale in S3D. This allows me to quickly draw and extrude to scale and show our clients a snap shot of potential layouts in 3D while still having reference to existing items in 2D view.
Have also been 3D printing layouts.

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what tool do you use to create 2d models?