I've printed tappet plates and some other items, but it's not any cheaper than buying it really, if you can find what you're looking for. There is all that 3d modelling time to design/copy the part. I did print a lower receiver for my M4, found a model online made some changes to make it work with the gear box. And well it's a nice paperweight. Too much deflection in the ABS to work without a hours of sanding and such. Granted I only have a 2K printer...
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