system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't they make 3D printers like such?
gpt
First, you have a potentially good and profitable idea...keep that in mind.

3D printing is very useful, but not applicable everywhere, because of inherent advantages and disadvantages.  It's very useful, for instance, when a one-off item must be quickly designed and fabricated.  It's also good for prototyping new concepts.

Compared to more traditional manufacturing methods, however, it isn't typically cost-effective at high-volume runs.  So in this case, toys can be molded out of plastic using these traditional methods, and run in high volumes.  The result are toys that are cheaper than what one could print at home (look at current ABS and PLA filament pricing if you don't believe me), and more complex toys can be made this way.

As far as the complexity of current 3D printers, well, they require a certain inherent complexity to function.  Think about what they are required to do: three axes of precise, controlled movement, plus controlled extrusion, of a precise diameter, to produce strong, dimensionally stable parts.  That's quite a feat.