I've swapped out a couple of stock motherboards from the Shark SC10 in favor of Big Tree Tech boards. For one of them, I pulled the motherboard cabling through to connect to a board mounted outside. In doing so, I wanted to raise the printer up to make room for the cables. It also provides a little more room for air to circulate.
These are what I'll call the "basic" feet which run along one rail. I do have a couple which use two rails and mount flush with the Shark feet still in place. I figured these would be the most useful and should work with any 4040 rail system.
I printed mine with PLA+ and 25% infill.
The author hasn't provided the model origin yet.