100 x 100 x 4mm Bambu Lab A1 Mini build plate drink coaster. I printed it using PETG but any filament should work.
For an A1, P1, P1S, X1, X1C build plate version check out the Bambu Lab (A1, P1, P1S, X1, X1C) Build Plate Coaster.
Used the default settings for the “0.16mm Optimal @BBLX1C” system preset except for the following:
Quality > Line width > First layer: 0.42mm
Strength > Walls > Wall loops: 3
Strength > Sparse infill > Sparse infill density: 15%
Speed > First layer speed > First layer: 40mm/s
If you have a Bambu Lab AMS, AMS Lite, or any printer that can print two or more colors on the same layer, and you're using the Bambu Studio or Orca slicers, then follow these steps, or load the ‘3mf’ file, or you could just print using the print profile.