I had to convert it from .mp4 format to .avif to upload it and unfortunately the sound doesn’t seem to have come across when I converted. In the original .mp4 it makes a loud clang on the Y-axis return stroke. I just hope the toolhead cover fault isn’t the result of that hard Y-axis movement.
Oh forgot you were talking about the sound I saw this and was like "Mine don’t do that, that’s weird " 
How hard was that metal gear swap-out? I bought that upgrade along with the hardened steel nozzle assembly and it arrived yesterday.
Since Bambu has shipped the electronics to see if that clears my “Toolhead front cover has fallen off” fault, I’ll have effectively rebuild my entire toolhead in the end. The wiki says there is a Hall sensor that detects that fault. Here’s hoping it is the problem and not the slapping the back corner of printer. 
The hardened steel nozzle seems like a no-brainer because it should wear less on things that aren’t impregnated with glass or carbon fiber and I can print things requiring carbon or glass as needed.
It’s fairly easy to swap out and took me about 10 minutes to do but I am very comfortable tinkering with machinery, but for a beginner to intermediate tinkerer it should take about 15-20 minutes with following a guide.
If you go to the Bambu wiki there is a guide for unclogging the extruder that shows how to pull the extruder apart, it’s just a case of following this but installing the upgraded gear rather than using the old one. They also have a stl there for a tool to help remove the gear if it’s hard to remove, I didn’t need it but it would be worth printing for if you do.
Well, I’ve built a supercharged 510 ci boat engine so a toolhead shouldn’t be an issue. I’m more concerned about the “gotcha” type items due to being unfamiliar more than anything. The “do this before you do that” or “this tool will make things easier” type issues. Plus my big paws don’t like these tiny 1.5mm and 2.0mm screws but magnetic hex bits are worth their weight in gold messing with the tiny stuff.
Nothing to catch you out really, I got big paws too and managed it. A good hex set will help as the little screw on the cutter was tight on mine.
I memory serves me correct it should be two screws holding in the hot end to undo, disconnect the wires and remove. Remove screw from cutter this is a little 1.5, helps to push cuter in slightly to remove pressure on the screw. Take off PTFE guide above extruder one screw each side. Undo 3 screws holding extruder in, one behind the cutter arm, one up by the PTFE guide on left and one on the right, unplug and remove. Then it should be two 2mm hex screws holding the extruder case on. Remove the screw from the tensioner and it should all come apart.
It’s been a long time since I have removed it so double check the wiki link in case I’ve missed something.
I rebuilt the entire toolhead effectively.
Between the pcb’s Bambu sent for the bogus front cover has fallen off problem and the hardened steel hotend and extruder gear and it didn’t help. Still faulting. If you have ever sat there and watched it do the long calibration, I’m leaning more to the Hall sensor has a problem. I don’t really understand why they even did that. Why not just screw the front cover on like the middle and back covers.
I’ve been reading posts about that front cover problem and that seems to be an ongoing problem based on the quantity of unique “Help me solve the cover problem” and how far back in time they go.
Did you get it figured out? My one week old P1S makes the exact same noise as yours.
I haven’t had a chance to do the swap yet. This weekend, I will 100% make it and keep you posted. Sorry, Life is just busy 
Okay so after i did the extruder swap I am still hearing the metal clanking sound when printing, this is starting to get annoying for me 
Have you done any mods like put Dlighting to the printer?
The toolhead, X and Y axes have very tight clearances when it zooms around inside the case so could easily be hitting something.
Does it make the noise throughout the print or just a single time at start or stop of a print?
It sounds like it happens on retraction maybe? I don’t know, it happened throughout the print, I have an ams riser on the printer but I don’t think that is the problem.
How tall is riser and is top glass on, off, elevated.
I had some issues with the chain/filament tube slapping the right side top edge of housing and it made noise sometimes but fixxed it.
Sometimes best thing is to pull up a chair and sit at the printer because being there you can get an instant visual snapshot of toolhead and sort zero in on noise.
Video camera worthless because of slow framerate.
Assume no faults though?
Feeding alright? Prints doing okay even with noise?
I started a benchy and watched it for the full print it sounds like it is on retraction or Z-hop but I cant be too sure, prints are fine and are what I consider great prints. Also printed the AMS on the table and removed the riser. No glass or anything else as I’m printing with a P1P, not P1S. I’m having adhesion issues but I think that may be because I need to wash my pei plate or it’s wearing out I don’t know yet. I want to stop this clanking noise right now.
I had my p1s 1 week and it makes the exact same noise. It’s clearly only when retracting and from the toolhead. Did anyone figured out what this is all about?
it’s normal, sound coming after print bed movement for z hop.
The sound is also there with disabled zhop
Yeah when I first got my printer I never heard the noise, I hear it all the time now.
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I have exactly the same sound. It appears after a week of buying the printer. The metallic retraction sound is only present on the first layer.
Did you solve this problem?
Nope, even after swapping the extruder, the noise is still present. It sounds like it’s only during retraction.
I don’t know what other fix will be for this.