I just received a new SLA printer from AliExpress. There are scratches of different shapes on the bed, as seen on the photo. I am particularly worried about a set of scratches of about 0.2 mm depth seen at the top right, but there is also a lot of shallower scratches at the bottom right.
The seller says that it is not a problem and it results from "testing". I am not sure. I have never used SLA printers but I have used an UV resin as a glue and I frequently scratched the glued objects to make the glue adhere much more strongly.
Do these scratches decrease the usability of the bed?