Folding portfolio with strap — test patterns and 3D configurator

Folding portfolio with strap: adjustable dimensions, separate pieces, holes and PDF, SVG, DXF export. Test design for checking on a mock-up.

Folding portfolio with strap: design example

The folding principle was reconstructed from a historical diagram; all dimensions are estimated: 220 × 280 × 45 mm. One full layout with side wings, flap with snap. The strap passes through paired side slots, holding the overlap in place. Check its routing and length on a mock-up before cutting.

Open this example in the designer

The example opens with the dimensions specified below. Its changes are saved separately from your regular work. You can return to it using the link in the editor.

Example source parameters

Linear dimensions are given in millimeters. Parameter names match the designer fields; these are the initial settings and can be changed.

Parameter	Value
Body width	220
Body height	280
Body depth	45
Flap drop	155
Strap blank	1400
Strap width	20
Leather thickness	1.5
Stitch offset from edge	4
Additional seam allowance	0

Parts in this example

The dimensions below are derived from the geometric model. The parts list changes with the parameters and enabled options.

Piece	Size, mm
Body with flap and side wings · Spread	311.0 × 805.0
Adjustable strap	1400.0 × 20.0

How the size changes the pattern piece

Calculation example: the body width parameter was changed from 220 to 242 mm. The diagram shows the Body with flap and side wings, full layout piece · layout before and after recalculation at the same scale.

Folding portfolio with strap: Body width 220 and 242 mm — The dimensions below the drawing refer to the outer cut-edge contour. This is the result of a geometric calculation.

Open modified example

You can also download the modified JSON project. After modification, check the assembly on a mockup.

Download the pattern example

The files were generated using the standard VLOTHO CAD export from the parameters specified above. They show the model geometry and do not replace checking the product in the material.

PDF A4, 15 sheets PDF patterns, 1:1 SVG patterns, 1:1 DXF patterns, mm JSON project

PDF A4 automatically selects portrait or landscape pages and rotates the pieces to reduce the number of sheets. For assembly, a 10 mm overlap, numbers, and alignment marks are provided. The standard PDF contains one piece per page. Both variants include a 100 mm test segment. For your own dimensions, modify the project and export a new PDF. How to print patterns at 1:1 scale.

What to check before cutting

Calculated construction. Physical sewing has not been tested. First assemble a paper or inexpensive leather mock-up, then refine the fit and hardware.

VLOTHO CAD builds a geometric prototype. Allowances for bending, skiving, assembly thickness, and construction methods are determined by your material. Start with a paper mockup and a trial piece.

How to get a pattern for your dimensions

Open the model and set the dimensions in millimeters. To reproduce the tabular example, first load its JSON.
Check the parts list and enabled options. Adjust the seam and dimensions for your material.
Save the project and export a new pattern set. After changing the dimensions, the previous files no longer correspond to the project.

Dimension reference for this model: Stitching line. Dimensions in the parts table and the outer cut contour may differ due to the seam allowance. How to check seam allowances and stitching lines.

Materials and assembly

Select the leather according to the required stiffness and assembly method. The image was generated and shows the intended appearance.

File preparation

Printing patterns on A4 at 1:1 scale · DXF units and layers before cutting

Next step

Construction and export instructions · Manual contour editing · All models