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Finned Paintball

by Hurtzmyhead, published

Finned Paintball by Hurtzmyhead Jun 21, 2011
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6839Views 903Downloads Found in Sport & Outdoors


Just ordered my makerbot so i'm waiting on it to come in before I can construct this. Until then, do not try and make as it is just an idea.

The paintball itself is not compatible with a normal paintball hopper as it must be oriented in the correct position. It should be able to be fired out of a paintball gun through the barrel (not suggested, as the gun can fire accidentally) or if length is shortened, inserted in the breach in the correct position.

Expect magazines for these paint balls, and perhaps an open source paintball gun sometime in the future.


Constructed out of PLA plastic to be bio-degradable and have a brittle shell. Paint (non toxic) should be injected into the tail end.

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Printed this. Took some playing to get it print right as all I have right now is abs. Speed 50. WoRed barely. Tested it in my t8.1 and it blew to pieces. Needs work...

could probably work if you print flat bottom down? i might try it, lol

i use first strike rounds in my T9, they rock. It's cool that you designed them on here!

To the first poster - on chrony speeds and rifling:

Usual chrony velocities are 280fps at paintball fields.

Also rifled barrels aren't an issue either. Most people don't have them as paintballs have to be near-perfect for rifling to not decrease accuracy (eg spin the paintball out is usual). I have an Armson barrel that is polygonally rifled - an
d very accurate - but only with good paint.

A rifled barrel might be able to score the fins into an unmodified paintball? I'm imagining a rifling that cuts deeply into the sides of the paintball (without breaking?!?!?)

maybe it'll need to start out with a small pitch angle and increase the pitch angle towards the end?

P.S. non-gelatin paintballs are not field legal. Guns that fire more than 200 - 400 fps muzzle velocity are not range legal (each range sets its own standard there) Rifling is definitely not leg

First Strike paintballs consumer grade polystyrene (not gelatin) paintballs that are from what I have heard, field legal. Rules from field to field change, but I know most of the owners and refs in my area and I believe that they would allow it. Worst case scenario is you have some paintballs that you use for marking the neighborhood cats (im just kidding dont ever shoot at innocent animals).

I have not messed around with rifled paintball barrels, as they are few and fare between. However, I have read into some of the statistics on the accuracy of a rifled barrel and all it seemingly does is break more balls due to the fragile nature of the gelatin shell.

I am curious as to why you s
ay that rifling is definitely not legal, I have not been able to ask a field manager as of yet, but why would a field ban them?

Just a thought, if the material is an issue, why not make a mould instead? That way you could make these quite quickly in gelatin.

Now all you need is a barrel extension and you'll be sniping in no time :)

thats an even better idea, maybe a Amalgam type mold could make some ReBall type FS rounds

good idea, Ill try that when I get my makerbot in.

I need to mess around with barrel lengths because with this type of round it carries and straightens itself. Too long of a barrel could make it so there is too much friction with the barrel and shorten the flight of the round.

A longer barrel needs a longer burst of gas. So long as the pressure behind the paintball remains high, the paintball will accelerate. The faster the paintball the straighter and more accurate the shot. :)

Yeah, im defiantly gonna wanna mess around with these. Unfortunately, all of the long barrels I have have all sorts of holes in them, reducing the amount that a longer burst of gas would actually help.

Like the idea on an open source marker. A finned ball has been done (circa 1996). Same for football shaped, golf ball dimpled, etc. The trouble with the gelatin fins I've seen is that they reacted to humidity and warped, so were counter productive. Anything not gelatin is potentially dangerous and might not be field legal.

A finned ball has been done before, but not a printed finned ball. The First Strike balls as @imberiman posted are made of polystyrene, and im not sure how PLA compares. I will be sure to do some tests on how they measure up.

Tiberius arms makes these already. They are called "First Strike" you might want to check on the patenting. I dont know if it matters or not as I am in no way a lawyer. But I did stay at a holiday inn express once. Also if you need any help with paintball equipment I have been playing for over 16 years.


I was unable to find any patents on their design. However I do not believe that they can do anything besides request that I take down the file if they do have such a patent. However, I do not intend to sell or take away from the profits of their company in any way.

Thank you for sharing this,


p.s. I plan to design a paintball gun and release it later this week. Being an experienced player, could you try out my design and post any flaws that you might find?

A patent is a deal that you publish your invention after which you get a limited monopoly on the production of your invention. Things here are mere publication and can not be blocked by a patent. That will not stop the sleazy types from trying to bully you into submission, but there is no law about publishing your ideas/inventions, even if they are covered by a patent.

thank you for the clarification

I would love an open source paintball gun! Please don't abandon that idea! Let me know if I can help...

we are going to be doing alot with this design. this paintball design is much more stable and has a great distance and accuracy. hurtz and I are discussing making a bolt action rifle to fire these suckers (rate of fire doesnt matter with a one shot one kill) so we will update with those ideas as they come

OMG THIS IS SO 1337. Seriously, good job man. I bet you are a genius. but i wouldnt know because i have never met you...

Lol @ ur screenname...