HzdaDeve 2 Pack A1 Mini/A1 Hotend Print Head Hot End Kit Extruder Upgrade High-Temperature 0.4MM Hardened Steel Nozzle Replacement with 4PCS Silicone Cover Sock for Bambu Lab 3D Printer Accessories

Absolute Waste of money, after 2-3 hours of printing both my printer has clogged extremely and had to change the Hotend Heating Assembly to fix the printer costed around 5-6k

Bought these because they were the fastest replacement I could get as my genuine nozzle had gummed up internally and I couldn't get it clean enough to flow filament well again, but the printer was not experiencing any sticking issues nor probing issues before installing. After installing I realized fairly quickly that they aren't quite the right size, and because they're made sized slightly incorrectly they trigger all sorts of print errors using any of the built in protections of the printer, print bed detection, auto bed leveling, the initial probing, blob detection, etc. Basically it'll think you've got a filament blob because the nozzle size is slightly larger, it can't read the plate or z position because of it, it has trouble making the filaments stick, likely due to the length of the nozzle being just slightly off compared to a real Bambulabs nozzle, etc. just not precise enough in design to use on an actual Bambu printer, they're too precise in their tracking and they rely on it to give you good repeatable prints. I actually didn't realize it WAS an off brand nozzle until I got it in, so if you have problems using it, this is why. Normally I print in ABS 100% of the time, with no issues, but I had to switch to PETG to get it to print at all, and even then it was spotty at best, and just terrible at worst.

Really impressed with these, they measure from top to bottom with calipers identically to those of the originals and they work just as good

Definitely not the quality of the original

Something wrong with the temps on these. Whole house smells of burnt plastic after using this and have had multiple failed prints due to clogged nozzles. After giving these another shot, they actually work pretty well. Some kind of nasty off gassing at first and I found that turning my temps down a hair really seemed to work well. After using for a while now, I'm changing my rating to 4 star. Their CS reached out to me to provide a refund for the product as well but at this point I really don't think that's necessary. I would buy the .4 nozzles again.