Yes, we do a lot of in-house testing. We have a fully equipped print lab with 30+ printers. The brands we test on are: Ultimaker Original, Ultimaker 2, MakerBot Replicator 2, DeltaTower, Lulzbot Mini, Dremel, Robox, Prusa i3 Hephestos, Mass Portal Pharaoh ED and Stacker.