@Bridge-Of-Don Looks good! Flatter than my beds that are 300mm x 300mm. eg my TronXY, using a Scanning Z Probe:
a69bdad3-8746-4e02-af06-39834c933f18-image.png
The 'waves' were caused by a worn wheel on the X carriage. I found and replaced it, but it didn't change the overall shape of the bed!
325380da-0a20-46e8-9c1e-55e4b19e3932-image.png
I need to order some tool plate to get it flat, but then I'll need to change the heater too.
Ian