I tinker a lot with my 3D printer and have found myself needing, uh, replacements for circuitry, wires, and components I keep messing up in the process. (PSA: if/when you only have one 3D printer, please learn from my mistakes by not customizing the only printer you have that you'll likely need to print and/or buy replacement parts for 😆)

I've used Digi-Key several times and they've been pretty reliable and affordable!