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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.

SLA printer, scratched bed

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?

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  • $\begingroup$ Don't you mean to ask "Do these scratches decrease the adhesion of the resin to the bed?", the quality of the plate has already been decreased, you might be after useability instead! $\endgroup$
    – 0scar ♦
    Jan 17 '20 at 11:21
  • $\begingroup$ Oscar, I am new to 3d printing. Do the scratches matter? Do they decrease the usability? $\endgroup$
    – scriptfoo
    Jan 17 '20 at 12:02
  • $\begingroup$ I have no SLA experience, but others may answer this question (@Trish ?) $\endgroup$
    – 0scar ♦
    Jan 17 '20 at 14:01
  • $\begingroup$ Tell the seller to quit lying and give you a clean bed. Genuine testing does not degrade the item under test. $\endgroup$
    – Carl Witthoft
    Jan 17 '20 at 14:03
  • $\begingroup$ @0scar my knowledge on SLA is theoretically only, but I would deem a scratch that is more than 1 layer deep as excluding defect. $\endgroup$
    – Trish
    Jan 17 '20 at 20:38

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