These are really simple but very effective and make use of the many dead AA batteries we all accumulate. You can pick from one of our own flag designs which include shameless self promotion of our Tiny TIE FPV quadcopter https://pinshape.com/items/47297-3d-printed-tiny-tie-3d-printable-indoor-fpv-tie-fighter-quadcopter or make one of your own. Flags easily absorb impact of micro quads and stand up straight from the counterweight of the battery.
See them in action here: https://youtu.be/dcYMj5Lr5ls
To see more of our latest designs, visit http://www.3drebeldesign.com