When procuring a PCB making machine, you must prioritize positioning accuracy (ideally ±0.01mm or better) and spindle speed (minimum 20,000 - 60,000 RPM) to ensure clean traces and precise drilling. For prototyping, look for minimum trace/space capabilities of 4-6 mils. Additionally, verify the working area dimensions to ensure they accommodate your largest board designs, and check for automatic tool change (ATC) functions which significantly improve efficiency in multi-layer or complex production.