I’d say a standard 6040 cnc is the best value for your money here: https://www.amazon.com/DNYSYSJ-Engraver-Engraving-Drilling-Woodworking/dp/B08MPYJWMW/ref=mp_s_a_1_3?dchild=1&keywords=6040+cnc+router&qid=1620670409&sprefix=6040+&sr=8-3

I’ve been able to cut materials as hard as 1095 steel with the right cutters, feeds and speeds, and patience. It’s nowhere near a perfect machine, and is still more optimized for cutting wood, but at least the core hardware is solid, unlike the 3018s