Gate and Arch - No Supports: https://www.printables.com/model/436334-medieval-palisade-gate-arch-print-in-place-no-supp
Spiked Barriers: https://www.printables.com/model/435558-medieval-palisade-spiked-barrier
Lookout Tower https://www.printables.com/model/437186-medieval-palisade-lookout-tower-no-supports