Everything on the store is made in house on one of my collection of 3D printers (currently 7 active printers). I use Prusa, Creality, and AnyCubic printers to build the parts. 3D printed parts are built by building up tiny .2MM layers one at a time. The plastic filament is melted for a few seconds before it cools and hardens into position. Parts have solid exterior “shells” backed up a grid of “infill” inside.
Some EUC stands can involve over 30 hours of print time for all of the parts. All parts are printed in PLA filament which comes on rolls which contain a little more than 300 meters each.