For the record, I use these feet on my Maker Select v2 (not the plus model) and I printed them in PLA. I wasn't as interested in the damping effect as much as something a bit better than the rubber feet that came with the Maker Select v2 which were always falling off. I added felt to the bottom of these for padding and sound isolation. They work just fine in PLA for that role.
I had to remix the front feet to work with my Z braces but otherwise these are simple and great. Thanks!