This thing is still a Work in Progress so I need some time to build it.
I'll build a solar cooker with fresnel reflector, it should be super flat and easy storage.
There is a .stl file, the original total diameter is 1,4m, focal lenght is 1m, depth is 16mm.
Calculated power is over 1100 watt (central europe), real condition maybe 700-800 watt.
Maybe you should to resize it for your printer ;)