My propeller had an adheasion issue so it came loose and didn't finish printing. Since it did a partial print I kept it to see if it would still function which it did. I just happened to set it on the base and then another prop on top to put it away and I thought lets try it like that and it worked. So then of course I measured and it's 10mm so I sliced a prop verticle by 3.33mm. I sliced 3 props, each a different size from the other props provided. There's a 105mm, 170mm and 200mm. If you would like to do 3 of the same size just clone the size you would like. I probably wouldn't go thinner than 3mm as it may not hold up well or not be able to fly.

I printed each in a different silk color so it looks nice in the air.

I haven't tried it but you could probably extend the part that holds the propellers to add even more but this hasn't been tested. I would like to try glow in the dark or maybe find a way to add LED's without compromising balance. I'm sure it's possible but I just don't have the time to design it.

You need to be careful launching as all 3 props will go in different directions. They aren't hard but getting in the face or eye could cause damage. Also when launching keep the base face up, DO NOT point at anyone or anything!!!