New user. I can’t find any info on how long the filament cutter lasts, or when it should be changed. Or do I just wait until I get a warning from the printer? Thanks!
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There are no sensors to detect it and no hard and fast rules to say how long it will last as it would be based on filament usage, times cut and more.
You could periodically test it by manipulating the cutter pushing against the bar connected to the print head and pulling the filament back.
If the printer constantly reports problems when trying to pull back the filament, it could be time as that indicates a problem in that process. Make sure to discount any filament broken in the PTFE tubes as that is a different issue, but, under the same report.
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Bambu wiki says every 3-5 rolls of non abrasive filament and every 1-2 rolls of abrasive filaments
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Given my experience, that is a ridiculously low usage to throw away a perfectly working part.
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BL says check, not change every 3-5 rolls.
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Thank you for the hints. I totally missed the existence of the Bambu maintenance Wiki. Thanks! I’m only 3 days into using the X1-C but slowly feeling less overwhelmed. One thing now, I know what a good first layer should look like. I came from using an Flsun Q5, which was an excellent 1st printer to learn on, though frustrating at times.
After 800 print hours, I am still using the cutter the printer came with. If you don’t do tons of multi color prints with ams, don’t worry about it. Will be quite a while before you have to change it
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I have printed over 1,000 hours on multiple printers using the AMS for the majority of my multicolour models.
I have not changed my metal filament cutter or any other printer part except a hot-end which was my fault.
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My bad, sorry
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I’m just a hobby printer with 600+ hours on the X1C and I’m still on my original cutter too. I took it out at about the 200-hour mark to check it and it still looked new. It made me nervous that BL gave so many spares with the machine. 
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Doesn’t that seem kind of excessive?
Yes it does, I made a mistake and thought it said replace the cutter when it actually says check the cutter to see if it’s dull. @metrax pointed this out in a earlier post.
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Over 1900 hours on an X1C with four AMS units in operation. Still using the original cutter blade with no problems whatsoever.
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My current cutter is hovering around 1500hrs, I use assorted materials including coarse. I’m a tad surprised but am happy to leave well alone while its not complaining. I think the early days Bambu had retraction issues and in typical parts-cannon fashion they pointed at the cutter as part of the “could be this” in the diagnosis routine. I changed two early on because of this and eventually found the print head PTFE kink was my main issue.
Wow, good to know, well I got two cutters with the X1C delivery, then I bought three more (admittedly to take the order into free shipping). So it sounds that I have a lifetime of reserves.
X1C, 01/2023, 1500h+: original cutter, no issues
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Still on my original cutter in my P1P with 1800+ hours, lots of different filaments used too.
If you don’t follow maintenance instructions so don’t check the cutter, then you simply don’t know if you need to replace it or not. You think you are okay because it still works but when tomorrow your belt breaks because it has to drive a dull blade through the filament then what? (I have the answer in mind due to recent thread on that…)
I just hit 5000 hours on my P1S and recently checked my cutter after reports that it was stuck. The issue was a clogged hotend but the the cutter was still looking fresh so I’m going to keep rolling with it.
I have 1500 hours of very frequent color printing with 700-1700 filament changes per print. On A1 with AMS and still have the original knife.