1, high learning cost: * * * Operators equipped with 3d printing have many learning projects, which need to be studied for more than two months, including printing operation machinery, polishing and coloring, etc., and the training period is too long.

2. Busy at work: * * Operators who enjoy 3d printing of equipment need to work standing all the time, at least 6 hours a day, and most of them are on vacation, so they are busy.