If you're looking for the best hobby cnc router for aluminum, this one from Harbor Freight has a lot of great features. It's super cheap, but it does its job well. The aluminum bed is smooth, so it's easy to cut through the material. The fence is solid and precise, and it also has a tool-free design that makes assembly easy
I bought this CNC router because I'm making a mini wood shop in my garage. It took about four months to build and is one hell of a time-saver when using plywood and MDF. But more importantly, it cut like butter. I built it from scratch and learned how to read schematics (which is cost-prohibitive), etc., with the aid of internet research.
best hobby cnc router for aluminum