First of all, you may have a misunderstanding about the forging equipment added in 4.2. The drawings of new equipment (which can be forged) are all dropped from new copies, not learned from NPC. The starting price of such drawings is very high. Secondly, if you buy or roll these drawings, you should also consider whether the materials used to make these things can withstand you. There will be a new material in the production drawing of 4.2, and that material will also fall out of the new copy. Generally, the starting price is above 1000.

Therefore, considering the above two factors, if you have sufficient funds, you can choose to practice the former. If not, it is better to practice the latter. 4.2 The new copy needs a large dose of medicine. The price of precious stones will not change much.