I switched filaments. I’ve been meaning to change my nozzle, so while I was in there I did that too. When I printed a test print to make sure everything was good my first layer had holes in it.

Here is what I had to do to fix it.

• my new nozzle doesn’t necessarily have the same height as my old one, so I releveled the bed and reestablished my mesh bed leveling.
• my new nozzle probably doesn’t have the same heating characteristics as the one that I replaced, so I tuned PID.
• my new filament may not feed in quite the same way as the old one, so I updated my e-steps.