Got a 3D printer now, it's fun!

[clutch-monkey]

theres a rumour that the KGB had an undetectable plastic pistol in the 80s (but it was electric) called a 'Troika'

what did it fire and was it single use only?

[Benonymous]

clutch_monkey, as I recall it fired a regular pistol ammo in something like .40 cal

I imagine the Russkies have had a crack at the "undetectable pistol", supposedly Yanks have. The one I was reading about used caseless ammunition and compressed air for ignition. So they eliminated a hammer or cartridge. The pistol supposedly fired a ceramic .22 projectile. However, nobody's actually seen one, much less used one so it may be just a myth. This article seems to bear this out. Nobody has demonstrated a working firearm that is undetectable by x-ray.

The thing about the pistol from "In the Line of Fire" is that the guy made it to break down into regular, non-suspicious looking parts, so if it did leave an x-ray shadow, it could be anything. Even a completely plastic gun could leave a gun shaped shadow that would tip off security. I also think that any substance hard enough to do service as a gun barrel would be opaque to an airport x-ray.

[clutch-monkey]

ah okay, figured if i used normal ammo it'd still be detectable! figure heat and pressure would be a pretty big issue in non-metal barrels, or the cartridges are so low powered it'd be a useless exercise to begin with haha.

[da9jeff]

i wouldnt be using ABS for such an item, it would be some sort of carbon kevlar mix, with ceramics for the moving parts.

[Billzilla]

ah okay, figured if i used normal ammo it'd still be detectable! figure heat and pressure would be a pretty big issue in non-metal barrels, or the cartridges are so low powered it'd be a useless exercise to begin with haha.

If it was just a one-shot device, you could dispense with the cartridge and use the end of the barrel to hold the bullet and charge. The bullet could be disguised by alloy foil that gets blown out of the way when the charge fires.

Anyway, this is Gammaboy stuff ....

[RMX]

Using new tech to replicate old tech... 3D printing Records!

Sure, It doesn't sound brilliant but I still reckon thats pretty awesome..

More details/specs and even complete 3D model records can be found here: http://www.instructables.com/id/3D-Printed-Record/

[JamesB]

[Imposter Forg]

http://www.redmondpie.com/you-can-no...for-lumia-820/ there we go billiam print some of those

[Norm]

So, Bill, if understand correctly you have to create a support systems for what you are going to print with your system. I have been using Shapeways and using their laser sintered nylon and not worrying about support what so ever. Is it possible to print something like this Ariel Atom frame or would the support system drive you insane?

[Billzilla]

So, Bill, if understand correctly you have to create a support systems for what you are going to print with your system. I have been using Shapeways and using their laser sintered nylon and not worrying about support what so ever. Is it possible to print something like this Ariel Atom frame or would the support system drive you insane?

Most of that would be pretty tricky to do with my layer-type machine as yes, it'd need to also print a fair bit of support material. The frame would be a challenge but I'd give it a go.

[Norm]

So you are thinking that no matter how convoluted it could be done support style? Interesting, as I say I have been using their ridiculously expensive sinter to do my printing, but, some of the deposit style detail is amazing

[Billzilla]

In theory, yes, but the trick is getting the support material off without damaging the main object. It's usually not a problem though.

[Norm]

I did a really small Atom in a deposit plastic and it is very brittle, has that improved? I know that the Shapeways offering is the same

[Billzilla]

A really small one would be a bit brittle due to the tubes being thin. I can do up to 130 mm long, so not very big sorry.
I can cheat a little by putting the object onto the print table diagonally though to get a larger object.

[Norm]

Yeah, they were very small. Unless their job is just to sit and collect dust and never really be touched much, they are too weak. One of the other Atom owners was going to place some in crystal. I don't know if he ever did.

What are you considering your minimum not weak parameters? If you don't mind me asking? The sintered car was surface 1mm and wire 1.2mm and the little one was 0.3mm surface and 0.5mm wire