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How do I remove air wires from my completed PCB?

This tutorial requires:

DesignSpark PCB V11.0.0

If you have completed the placement of tracks but still have an air wire showing as below:

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Run the Optimise Nets function from ‘Tools’ on the menu bar or use the short cut Ctrl + D.

The correctly routed air wires will be removed.

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I'm a Mechanical Engineer by qualification though I worked for a long time specialising in Motion Control systems and integration with various PLC systems. I've wide experience of many types of applications from packaging machines to military and some applications that I can't mention. At home, I like to tinker and make things with wood, metal, plastics, electronics and mechanical system. I'm never happier than with a hammer and a screwdriver in my hands....