I have been making precision molds for many years, both in Japan and Germany! The so-called precision actually means that the insert can be removed as much as possible, and the tolerance should be considered before the important dimensions of the product are removed. Within the tolerance zone, the tolerance should be taken when the mold engineering drawing is inserted, and so on. Parting is beautiful, that is, you don't have to worry about money, you must be accurate if you can be the most accurate!