I was looking for 6, 7 and 8.5mm motor mounts to make homemade frames. Only found picnic quads motor mounts, but they’re between 0,70 and 0,95$ a piece. I would like to get a bunch of them, so the price would be high enough to make me think of alterenative solutions, such as the 6mm straws that i had at home (I found packages of 200 7mm straws for 5€ in amazon - and that’s expensive for plastic straws, but maybe i can get 2000 motor mounts from it) Sadly, didn’t find 8.5mm straws.
Straws are also very light. The weight of my straw-octocopter frame is just 5gr. They’re not as rigid and strong as a carbon fiber frame, but for 6mm motors, they’re quite durable, and way cheaper!!
I plan to do some more frames using straws. It’s a funny and cheap way to experiment and try crazy designs you wouldn’t do with other more expensive materials