Fully Printable Outdoor Stomp Rocket

I've created a stomp rocket for use outdoors. The bellows and hose are printed in 95a TPU (I'm using SainSmart Green Flexible TPU) and the Launcher tube is just standard PLA. The Large Bellows should shoot about 50/60 feet in the air, while the small bellows is about 15 to 20 feet. Scroll to the end to see it in use.

Print time:

The Time is incorrect on profile because I included both a large and small bellows.

Large Bellows + Launcher Tube + Hose + Rocket: 15h 41m

Small Bellows + Launcher tube + Hose + Rocket:  13h 31m

Print Material:

TPU: SainSmart Green Flexible 95a TPU

PLA: Probably black Sunlu, maybe black Overture

Post Printing:

The Rocket has an internal support that will need to be removed in order for it to slide over the rocket launching tube.

The small bellows has internal supports. If you watch this video I show how to remove them. The video itself is from an earlier design of the large bellows (which no longer use internal supports), but it shows my “Gator Roll" method of getting out internal TPU supports out.

Assembly:

The Hose has a built in O-ring that connects to the port on the launcher tube and the bellows. To connect to the launcher tube you make a U shape with the end of the hose, then push it into port on the launcher tube and sprint it. It should got back to it's original shape and lock into place. On the bellows side you can just put the tube in till it slides into the O-ring slot.
 

General Thoughts:

95a TPU and lower should be used. I tried using 98a Priline TPU because it could be printed through the AMS and it's rigidity caused it to tear / break almost immediately and much harder to stomp. From what my friends have said Bambu's AMS TPU is even harder. I think the harder TPU would also make stomping the bellows much harder. If you go with a softer TPU, you will most likely need internal supports, my suggestion would be to use auto Tree slim and you should be able to use the the gator roll method I posted above to get them out.

If you are using an AMS, this External line Y splitter makes it really easy to feed in TPU and then when you are done switch back to the AMS for printing the launcher tube.

I tested the launcher tube sanded and un-sanded and I found there to be very little difference in the distance the rocket went, so sanding is up to you.

This is an FDM 3d print made to be stomped, so even though I tried to make it so it wouldn't break easily while still be flexible, don't be super surprised when it eventually breaks. The smaller bellows can take a better better then the larger bellows, my daughter and her friends beat the crap out of it for a few days and I don't think it had any tears. The larger bellows does have a weak point at the collapsible part of the dome, but even then we got a few days of hyper kids using it without it tearing. Minor tears don't actually matter that much in both designs and the stomp rocket will still work fine.

I'd suggest the smaller bellows if you have a smaller yard, as I have a decent size yard and with the large bellows the kids had to ask to go in the neighbors back yard a few times while playing with the stomp rockets to get their rockets. I would not recommend using it indoors, I tried it with the small bellows and my ceiling didn't enjoy it.

The fun of making your own stomp rockets is you can modify the rockets how ever you want. In one of the videos you can see I'm shooting a cat rocket and I've also made a Pug rocket as my daughter loves Invader Zim. Feel Free to Remix my designs. The internal tube size on the rocket is 18.5mm diameter and 141.5mm tall.

If you enjoy the rocket, think about boosting me.

Videos of Rockets in Flight:

Large Bellows

Small Bellows (I did not design the cat head, just the rocket which I placed the cat head onto.)