Hello, I purchased my X1C a few weeks ago and have been printing like crazy.
I was printing some fallout coasters and I noticed a scraping noise, and I looked in my printer and its scraping the infill and leaving small hairs( it looks like ■■■■) I know its the infill so it doesn’t really matter for something this small. I haven’t adjusted any settings in bambu studio. I’m using all bambu petg filaments in my AMS(using the settings that ams reads off of the spool). I performed a calibration last night and I printed two small semi flawless prints a few days ago.
Then I tried to print a AMS riser with petg I just got and it failed, I added pictures of the failiures
any help would be appreciated
Thanks
Had this exact same problem with PETG! It appears to be a pretty common issue with that filament. First, I made a custom nozzle preset in the Bambu slicer. Click the little pencil edit thingy, and create a new nozzle preset - I called mine PETG. Then in the gcode setting I raised the nozzle .03. It looks like this (I’ve bolded the line that I changed, nothing else is different, but wanted to show what’s around it so you can find it easily) :
;===== reset machine status =================
G91
M17 Z0.4 ; lower the z-motor current
G380 S2 Z30 F300 ; G380 is same as G38; lower the hotbed , to prevent the nozzle is below the hotbed
G380 S2 Z-25 F300 ;
G1 Z5 F300;
G90
M17 X1.2 Y1.2 Z0.75 ; reset motor current to default
M960 S5 P1 ; turn on logo lamp
G90
M220 S100 ;Reset Feedrate
M221 S100 ;Reset Flowrate
M73.2 R1.0 ;Reset left time magnitude
M1002 set_gcode_claim_speed_level : 5
M221 X0 Y0 Z0 ; turn off soft endstop to prevent protential logic problem
G29.1 Z{+0.3} ; clear z-trim value first
M204 S10000 ; init ACC set to 10m/s^2
Then, after that I went through and changed a few of my print settings. There’s a super good article here that explains the exact settings to change. 
How to Succeed when 3D Printing with PETG Filament | MatterHackers
I hope this helps! I’ve printed for years with PLA, and was really surprised at how much it took to get PETG working well on my X1C.
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Thank you!
It’s weird, i’ve printed dozens of things in petg blue/yellow/black/white, Once I switched to this bambu grey petg, I ran into all sorts of issues. I ended up drying it and it still did it, so I will try what you suggested!
Right? Bambu PETG gray and black are the ones I have, and they were a mess. I’ve been scared to try other colors, but it sounds like maybe they aren’t as finicky? Good to know!
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Did you raise the Z value now by +0,03 or +0,3mm?
You have written 2 different values.
0.3mm must be to much right? It must be 0.03mm
Oof, yes that was a typo 0.03 is the correct value 
Same issue today with BB Grey PETG. Since the first few layers looked fine and the infill looked like yours, I slowed it down and upped the temp.
I am using 8mm3 max flow and 265C hotend and it looks perfect now.
MINE did this today and the hotend snapped broken this time
Shouldn’t use grid infill with bambus. Also keep in mind that infill speeds are faster than wall speeds while putting down an even wider line. When running too fast, youll see the infill fail 1st.
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