Many of them will have a pre-purchase proofing, but the actual proofing and production is two things, at the time of purchase to consider the long-term stability of the machine is the most important, such as UV machine proofing effect is very good, but soon after the speed becomes slower, if You buy such a machine to go back, the results do not have much time to speed even more, it is certainly not profitable, and even some of the machine proofing is very good, but three days bad, it is more depressed, so Enough time to buy the machine must know the performance of this machine and proofing results and after-sales service to consider the choice of comprehensive choice.
