Higher-quality Biter Spawners now have slots for quality modules. You can upgrade a lower-quality Biter Spawner by placing a higher-quality one on top, and bots will handle the replacement.

Producing Biter Spawners requires uranium, Biter eggs, and Gleb products—all of which are challenging to obtain. I felt that a 150% spawn production boost alone wasn't a sufficient reward for the effort. With this mod, you can insert quality modules into quality spawners (one module slot per quality level), allowing you to speed up the production of high-quality Biter eggs.

Code based on the QualityEffects.