Credit Card Project for my Dad (Engraving EMV Depth)

Hey guys,

This is my first post. I am fairly new to the engraving scene as I had just bought a 50W fiber laser about 3 months ago. I have been playing with the settings and thought I would make a cool star wars credit card for my father for his birthday. I had bought some blank grey stainless steel cards from China and started working on them. I was thinking about just engraving the depth for the EMV chip. These cards are about 0.88mm in total and the engrave has to reach it seems like 0.33mm in depth. I am running the laser on a hatch of 90%P/500mm/40frq. I am just looking for suggestions about whether I should engrave that emv chip slot or if anyone else has a better idea. All of your help is greatly appreciated, and look forward to asking more questions in the future.

Sorry another problem I meant to mention. The cards because they are so thin seem to ward a bit. I am thinking of using a Peltier thermo-chip with a variable resistor for the base plate to cool the entire base plate. Saw some people use damp towels and such but just a thought.

Thank you everyone!

Or buy a thicker card from a few vendors, chewbarka is one, they have some that are 1.5mm thick and they won't warp. Just sayin. I've a pile of the thin cards I've used to test setting with, and they are pretty CHEEP. Bend way too easy. cute, but not really worth the time to do anything major with.

with practice you can reverse the warp almost exactly by 'engraving' the backside, out of focus...