That question is difficult for us to answer, as it really depends on your plans for the laser machine and the largest size material you plan on engraving or cutting.  Redsail laser's patented open architecture provides you with limitless opportunities, but size of machine will ultimately determine the size of material and ease of engraving ability. Generally, bigger is better simply from the standpoint that if you have a bigger machine you have more options and opportunities to engrave larger objects than if you purchase a smaller machine. It's entirely up to you and which revenue streams you'd like to tap into.