I haven't really kept up with 3D printing technology, except in the most general way, so I apologize to the engineers out there,if I ask what are ignorant questions.

Most of the good plastics are two component systems. Are there two component 3D printers out there? I would imagine two component printing heads would be a nightmare to keep working reliabily. I suppose one component as a bath, and the other in the printing head would more reliable, but limited to just a few choices of materials.

Are there 3D printers capable of incorporating re-enforcing fibers or other re-enforcing materials?