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I'm actually not afraid of printing things larger than a few square inches on the bed.... Waited way too long for this. Tightening up the eccentric screws on the bed carriage so it doesn't wobble also helps.
That looks great. How did get such good adhesion? My bed is super uneven so I switched to glass and had incredible results, but I have to babysit the first few layers because 50% of the prints are wrapped around the nozzle by the end.
I dunno, I use a mirror tile heated to 60⁰C. TPU and PLA seem to stick just fine. Have you tuned your first layer height?
I also give it a good scrub with isopropyl between prints.
Cleaning the print surface with warm water and soap, and then avoiding touching it with your hands, is a good start if you haven't done so alreayd. Calibrating first layer height, flow rate, temperatures, etc. is generally the way, but if you want a quick and easy solution I gotta say that Magigoo has worked really well for me. It's a bit expensive, but I've reapplied it a few times and never have to wash the bed so that one bottle will likely last a lifetime. I think you can get similar results with a high PVA content glue stick or hair spray. And there are of course other 3d print glues which I haven't tried, I'm assuming they work equally well.