This model provides a simple elevated base for squash-ball feet. The height is set to match the height of the Prusa-Box squash-ball base models, and accounts for the thickness of the enclosure's steel cross-beams. The model also includes a slot for a M3 nut + bolt which can be used to secure the base to the enclosure floor, as long as you're willing to do a little drilling. Alternatively, the two slots near the bottom can each hold a 10x5x2mm magnet.
The author hasn't provided the model origin yet.