Any ideas

[curious aardvark]

could be the model - but it's an ender 3 - so could also be just about anything else.

Bed not level, bowden tube at a bad angle, gantry sticking or not level etc
Looks like the dodgy print is at the side that doesn't have the z-motor. so could be an uneven or sticking gantry.
When the extruder is all the way across - away from the extruder motor, there are a couple of fairly tight angles in the tube that could cause an issue.

Try printing one behind the other on the same side, as near to the left (z motor side) as you can.

That will at least eliminate a couple of the potential issues and let you narrow things down a little.

[9mmAuto]

Thanks for the quick responses and ideas. I will try the suggested fixes and see how it goes.