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Here's what worked for me.

1. Extract vertices from your line layer.
2. Install Shape Tools Plugin. Use Create Shape function and create a "line of bearing". For the Azimuth Field input select ANGLE. For the distance field, nothing. Then specify a standard lenght for all the lines.
3. Run it and you'll get a new line layer with the extendened lines. If you need the lines to go the other way, reverse the azimuth values. Hope it helps!

Here's something simple that worked for me.

1. Extract vertices from your line layer.
2. Install Shape Tools Plugin. Use Create Shape function and create a "line of bearing". For the Azimuth Field input select ANGLE. For the distance field, nothing. Then specify a standard length for all the lines.
3. Run it and you'll get a new line layer with the extended lines. If you need the lines to go the other way, reverse the azimuth values.

Here's something simple that worked for me.

1. E

Here's what worked for me.

1. Extract vertices from your line layer.
2. Install Shape Tools Plugin. Use Create Shape function and create a "line of bearing". For the Azimuth Field input select ANGLE. For the distance field, nothing. Then specify a standard lenght for all the lines.
3. Run it and you'll get a new line layer with the extendened lines. If you need the lines to go the other way, reverse the azimuth values. Hope it helps!

Here's what worked for me.

1. Extract vertices from your line layer.
2. Install Shape Tools Plugin. Use Create Shape function and create a "line of bearing". For the Azimuth Field input select ANGLE. For the distance field, nothing. Then specify a standard lenght for all the lines.
3. Run it and you'll get a new line layer with the extendened lines. If you need the lines to go the other way, reverse the azimuth values. Hope it helps!

Here's something simple that worked for me.

1. E