Are the stepper motors squeaky, or are the squeaks originating from where leadscrew and lead screw nut contact?
Have been using Silicone food grade grease where possible, same stuff I use for faucets. For example Danco https://www.homedepot.com/p/DANCO-0-5-oz-Silicone-Faucet-Grease-88693/203193536 and Super Lube food grade Multipurpose Grease: PTFE, White.
Curious what people use, ideally something that doesn’t end up with chips/dust sticking.