See this wiki page detailing some upgrades you can make to your base eVOLVER hardware!
Highly Recommended Upgrade:
Vial cap upgrade enabling emergency efflux - [made by @danhart]
Emergency efflux is a dedicated tubing line to prevent vial overflows, which are both the most common and most devastating eVOLVER hardware issue. These vial caps enable a fully air-tight seal, so any excess liquid will go down the emergency efflux tube.