Power Runs
Power makes the world go round… at least it makes your Fabricator run in Horde 3.0, anyway. Conveniently, fallen enemies will drop Power for you, used to charge up your Fabricator and purchase new fortifications and weapons. While it’s definitely possible to pick up Power while the round is still going, leave this until the end and be clever in who you send out to pick it up.
If one of your team is using the Scout class, they should definitely be the primary Power scavenger in your team. The Scout’s unique ability doubles the amount of Power they’ll pick up compared to any other class. Use this to your advantage so you can build more fortifications and survive for longer. You’ll have a good 20-30 seconds before the next round starts too; this should give you ample time to reach most of the Power dropped by the Swarm and return to your Fabricator safely.
It’s also worth noting that the more Power you deposit in your Fabricator, the faster it’ll level up, in turn unlocking stronger fortifications and more powerful weapons.