Change the line width for example toward to 2 mm.It is important that it is a copper layer otherwise it would not work. Select the copy of the board shape and convert the layer from mechanical 1 to top or bottom layer.Copy the board shape ( mechanical 1) next to the the PCB.To create a board shape in Altium press while selecting the objects. Select the board shape (*), Mine was on mechanical layer 1.For explanation purpose I created an weird example PCB shape. Create the pcb border/shape using a mechanical layer or keep-out layer.(* Press (CTRL+h) and click on the wire to select the whole connection) Step 1 However, Altium does not provide this scaling functionality that’s why I wanted to share my tiny workaround to create the scaled version of the polygon. To do this Altium Designer should provide the functionality to scale the polygon by a value or percentage. This polygon is a scaled version of the board shape. In most cases I use a polygon connected to ground as internal plane. In Altium it is possible to implement an internal plane but most designers I know (me as well) don’t like that approach as the copper does reach till the outside of the PCB shape. Why should I need to resize a polygon? Most of the multi-layer PCB’s I made had a ground or power plane inside the PCB.
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