@Jeremiah_Coley I got past the problem with the corner lifting from the bed, though I varied more than one parameter, so the cause is not (yet) clear. Still have under-extrusion(?) on the concave outer area. Also picked up roughness on the top surface (over-extrusion?). But … much better than initial settings. Still trying variants.
The bed surface on this re-branded Wanhao printer is some sort of coating that works well with PLA. In fact, sometimes too well, so I use glue-stick to limit adhesion.
With ABS have only tried with glue-stick on the bed.
It’s that stringing in the corner? Did it just flick out?
Relatedly I’ve got a few bits of foam packing sheets from stuff that I tape together to make a ghetto enclosure, seemed to help on long prints I was running
At the end, my Chinese i3 clone (Monoprice Maker Select Plus) can manage 40mm/s when printing ABS. Much, much slower than PLA.
To be clear, better firmware could likely improve the performance. A better hot-end could likely improve performance. Likely I will not do either, at least in short term.
I bought this printer as a bootstrap to print the parts for my next printer. If you want a very well done Prusa i3, buy one from Prusa.