Out of interest, (after the A4000 keyboard case I had printed), I had jlcpcb print this A4000D front cover Magnectic.stl for me in black. It's from RetroRejuvination on git hub. I had them use JLC Black Resin with standard-general sanding included.. total cost was $67.91delivered, and included all prepaid import duties etc. And I have to say, it is stunning! I hope these pictures do it justice! Oh, and not a sign of warping anywhere.