Wanhao Duplicator 3

[Geoff]

It really just must be the enviroment then, because I can't say I am doing anything particularly special, the only thing that I do that's not normal is levelling the build plate while it's printing, something I don't suggest because it can be ugly if you do it wrong, but all I do is print a 5x5cm square about 1cm high, and I watch the first two layers, if the lines on each layer are spread apart with any gaps between them at all, we're too far from the platform, If they are way too flat and the nozzle drags through it, we're too close .. so I watch the layers and see which corner of the bed needs adjusting on that test run, then usually the next print is fine. But as I said, i do it while the print is happening, both dangerous to hands if the hotbed descends for whatever reason suddenly on you or you bump the plate with the nozzle, I just watch carefully when I do it and be patient.