I recently found an Energy Dash Blueprint deep underground. I took it back up to my spaceship, but I can't figure out how to use it. How do I use a blueprint? I'm assuming it has something to do with the 3D Printer, but I can't figure out how to use the two together.
Just 'use' it anywhere. The Energy Dash blueprint you have is a type of tech that gets added to the Tech station on-board the ship. Once you've unlocked tech, go to the tech station on your ship, select a tech on the left, then click one of the "lock-in" buttons on the right to equip that tech.
I don't think it tells you how to use it, but the Energy Dash is used by double tapping left or right for whichever direction you want to dash in.
When using other blueprints, such as furniture or weapons, a little pop-up at the bottom of the screen will say "Learned to craft new item" confirming usage. The recipe will then be available for crafting at the crafting station used to make that particular item.