The regular 3mf files are Bambu Studio specific and include coloring. The generic versions are for people without Bambu Studio. I separately published the CAD files for the M inset into the bottom of the box. The M on the outside of the box is from here: https://www.thingiverse.com/thing:149119. The box and the coasters themselves were done in Solidworks. I have the files if anyone is interested.

UPDATE: Per a request, I added an STL of the coaster.