The main disadvantage is the overall cost, especially for short-run productions. Some of the reasons for the high cost include specialized equipment, costly refractories and binders, many operations to make a mould, a lot of labor is needed and occasional minute defects. However, the cost is still less than producing the same part by machining from bar stock; for example, gun manufacturing has moved to Investment casting to lower costs of producing pistols.
Additionally:
It can be difficult to cast objects requiring cores.
This process is expensive, is usually limited to small casting, and presents some difficulties where cores are involved.
Holes cannot be smaller than 1/16 in. (1.6 mm) and should be no deeper than about 1.5 times the diameter.
Investment castings require longer production cycles compared to other casting processes.