This is just a larger rack frame for the original model by @ichwillkeinenacc. The larger rack frame is very handy to store network switches, power supplies and other stuff that might be part of a Raspberry Pi cluster.
The rack frame is exactly 4x the size of a Raspberry Pi rack frame, so you can build a 8x Pi cluster with a network switch in the middle for example.
For additional support and to be able to put things like a network switch in it, the rack frame has some additional crossbars in the back (my rack is hanging on a vertical wall mount). The slider pocket for the Raspberry Pi insert is still there, so you can also put a Pi in it which needs more space.
In case you wonder what fits in this rack frame, I've put the following two things in it:
Supports: recommended
Rafts: not needed
Resolution: 0.2 or finer
Infill: 15% (saves about 40% material)
Der Autor hat dieses Modell remixed.