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I just want to ask if anyone has successfully printed a screw (M3 or M4). Is the printed output usable as a screw? What printer is capable of printing screws? I am using an M3D printer - is there a configuration to successfully print a screw that is usable?

Can anyone share a picture of the best 3D printed screw?

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well... it's hard to imagine printing M3 or even M4 I haven't try but I haven't because I'm pretty sure it's not possible (on my printer of course)

but some time ago I've tried M8 which is of course way from your needs it was printed on 0.1mm layer height

it went ok into the nut without any problems but the strength is not very high I suppose

I know the quality is poor but even such bad photo shows issues

enter image description here enter image description here

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    $\begingroup$ I'd say it's not just your printer; no FDM printer is capable of doing stuff as fine as M3 or M4. $\endgroup$ – Tom van der Zanden Dec 10 '16 at 20:58
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I've had success printing pins at that size, but not screws. At that size the pins were also exciedingly suceptible to stress, ie easy to break. At that scale the tolerances are a bit tight when printing that small and there will be small variances in precision with most printers. The best example of this is to try to print a lego piece, they dont snap together, some are slightly to big, and some are slightly to small and sometimes they will break.

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Its just not possible on a FDM machine. for example using a layer thickness of 0.1 which is standard there would only be 5 layers of material between each peak (the pitch) for a coarse M3 and a fine M3 would not even have four layers (wikipedia on ISO thread) which is just not enough layers to resolve the required shape. The tensile strength of such a bolt even if you could print it would be abysmal.

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Not very likely unfortunately.

M3D nozzle diameter is too wide to be able to print something that would print reliably, not to mention any FDM machine won't have the precision to build good threads. even 0.05mm layer heights won't run very well.

I've tried on a Form1 (SLA style printer) and even that set at it's max resolution wasn't able to print clean threads.

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