Hobby? Those things cost over a quarter of a mil dont they?
So what exactly is a hackerspace? A club of some sort? I clicked the link but am unsure what I am looking at. Thanks for the help!Might be worthwhile to head up to Davis/Sacremento or down to Fresno to play with one of their 3D printers. The individual hackerspaces might have a class on designing stuff to print as well. http://hackerspaces.org/wiki/Special:SearchByProperty/State/California
Printing things like carbonator caps will take near 100% fill and a long print time. As well as you may be tied to the higher end printers, even higher than the M2, in order to have reliable print resolution and layer adherence to handle the pressure requirements. I'd definitely suggest getting in touch with a hackerspace mailing list to see if any of their members have experience with 3D printing pressure vessels. Maybe even Maker Gear themselves, or another printer manufacturer could give you some pointers.
I've a MakerBot Replicator 2X that I tool around with ABS plastics with. That could print your carbonator cap with little issue. I wouldn't want to rely on PLA for pressures that you'd need to use with a carbonator cap unless it was just to move already carbed beer around. Force carb with a PLA plastic cap sounds questionable to me.
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