I upgraded my home surround sound, and it just seemed unnecessary to spend a non-significant amount of money on new speaker stands given that I already had perfectly good stands that had served me well for years with my Sonos Play 1s. After disassembling, it seemed easy like an easy enough project for me to do fully from scratch.

You'll need the following screws to complete for each stand:

1x ¼ in-20 x 1 in round head machine screw - to attach the plate to the stand

2x M5x30 flat head screws - to attach the Sonos Era 300 to the plate.

To install this, you'll need to remove the bottom base in order to route the cable, so I'd suggest doing that first. Once that's done the bottom plate can be reattached, and then use the ¼ in screw to attach the newly printed top plate. The base plate is about the same width as the rubber feet, and they should sit in the groove, there'll be a small gap between the base plate and Eras once they're attached with the M5 screws from the bottom. I printed these in PETG with 20% infill and I feel confident that they're plenty strong to support the speaker, but feel free to increase the infill level.