PLA Filament Size

The PLA which came with my Snapmaker 2.0 type A350 was 1.75mm diameter. I was given a lot of PLA free but it is 1.70mm in diameter. Will this still work with the A350?

It should be fine. If it is genuinely 1.70mm and not badly-labeled 1.75mm, you might need to calibrate your flow % upward a tiny bit or something. Take your time dialing it in.