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you may find something off the shelf here
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I think it'd be difficult to reproduce with the accuracy and tolerances necessary to make it run properly, at least for any length of time. I have the software and equipment to model and print something which looks like that, but wouldn't be confident of it performing very well, or even at all.
For the modelling I think you'd need someone with specific knowledge of gear profile design or software which can do it automatically. For the printing you'd need a material and printing process best suited for the intended use. Both of those put it beyond the average person with a basic 3D printer (me).
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It’s probably made of acetal, sometimes known as Delrin. Fusion 360 cad software has a gear profile generator add-on so if you can work out what the gear tooth profile is modelling a new one is fairly simple. The tooth profile is most likely to be metric module (or MOD). If you can measure the outer diameter and tooth thickness accurately you should be able to work out what specification yours is.
But, as @Brun says, getting a 3D printed part in an appropriate material will be the hard part. You could use a 3D sintering process to make a metal part. No idea how much that might cost, mind.
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freezing77
Brun
hiraethus
@psg1ben
I'm having issues finding a replacement for this double spur gear. I imagine it's the kind of thing that is easy to make with a 3D printer. Anyway, I just fiddled about with a CAD image and it's all a bit fiddly because I'm on my phone. Is there a service that anyone is aware of whereby I can just send the gear to someone to reproduce?
It's for a small motor but has to deal with a decent load so bodging little RC gears isn't an option. Also means it'll have to be made of a material strong enough but I have no way of determining what exactly is it made of.
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