Under the printer : Medium wood 50 x 50 x 2 cm
Behind it : two black pieces of black acrylic -which could be wood- (~50 x 10 x 1 cm) hold a metalic 8mm diameter bar (~55cm) secured by a transparent acrylic part (~50 x 30 x 1 cm). Each black acrylic part is secured by metalic 90° brackets. Acrylic is toxic when you cut it, hold your breath +open windows or garage.
On the bar : a white PLA spool with 3D-printed holder including bearings, and a black PLA spool with skate wheels. ;D
So, I can move it anywhere in 10 seconds by unpluging the cables.