Base mounting plate and swivel 3d-printed. Riser and mount plate made of sheet metal and square stock welded together. Designed in freecad. Printed on a Prusa i3 MK2 PLA 50% infill, 0.2 mm resolution. Hardware M8 nut and bolt, and M6 bolt and wingnut. 

Made in 2016, still in use. Migrated from youmagine.