Apparently a year in the bathroom under a cup with constant moisture is enough to ruin untreated wood inlaid in an acrylic coaster:

A small 3D printed chipboard fragment coaster now enters service:

I recently ran into an interesting chipboard failure suggesting this one won’t last forever, so the clock is ticking.
About which, more later.
Spam comments get trashed, so don’t bother; you’re not as clever as you think. Comment moderation may cause a delay.