swordsmanlukeDon't forget to change your z offset after swapping nozzles
btw, what you’re seeing there is actually brass shavings. That glass bed is like sandpaper to your nozzle. I’d closely inspect it because you’ve likely rolled the brass over the tip by doing this.
Seriously, look at it closer and you’ll see bits of brass. That’s why the color is the way it is.
Additionally – you shouldn’t have this problem so long as you’ve actually rebuilt your hot end correctly. Nozzles have a standard (in the case of the Ender it’s a MK8) and generally even the cheap chinese ones follow that standard very well.
Thanks for the detail!
Fortunately, in this case I was using a brand new, low-quality nozzle I don’t really care about.
After this, I did indeed notice that I hadn’t tightened the nozzle fully tight and I had some mild “drizzle” escaping down the side.
Since then, I’ve
- removed the nozzle
- cleaned the gunk out
- put the nozzle back in
- leveled the bed
- rechecked my z-offset
and… It’s printing fine again.
Even the nozzle was alright… entirely due to dumb luck. 🤦
Yeah, the nozzles can survive a little bit of scrape-off like that, but it can change the orifice geometry so just be aware. What model/make of machine/hot end do you have, if you don’t mind my asking? The cheap Ender-style PTFE-lined hot ends are pretty intolerant to just nozzle swaps, and if you have one of those, I have some videos I recommend watching so you know how to rebuild it properly should you ever need to again.