Propeller guards for the T4 with 10" props and CF2822 motors.. Please note that this will only fit my arms (http://www.thingiverse.com/thing:481561) and not the arms on the original T4 by Brendan22To make them strong and lightweight print them with a very low fill, like 5% 3 skins and 5% fill = 40g 2 skins and 5% fill = 32g It need supports for the central arms and hub, printing it upside down requires the least amount of support