Uneven sprue thickness can create assembly issues and inconsistency in the wax tree. If you plan to buy wax sprue extruder machinery, Laxminarayan Technologies provides equipment designed for investment casting wax lines. The machine is used to extrude wax into consistent sprue shapes, supporting standardisation in day-to-day wax pattern assembly work. See the product page: https://www.ic-machines.com/wax-sprue-maker/