I think the tension on the main toolhead is already at max. I don’t have an ams lite, I’m feeding it from a filament dryer with bearing rollers to reduce friction and pulling force, through a short PTFE tube. I tried raising the temp 5 deg to 235 and reduced the max volumetric flowrate from 12 to 4mm3/s. I got 4 hours into a print and it failed… (it was not a big print but 4mm3/s is super slow, it’s TPU speed!)
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this is very similar to issues I have feeding Matte PLA, the extruder gear chews it up. I haven’t had this issue with silk at all, but I don’t have any Bambu Silk. I have noticed that the feed issue with Matte has only gotten worse over time.
The only solution for me was to switch to the external spool, haven’t had the issue from there.
My next printer will be a dual-gear extruder. 
That’s interesting, I know it’s not convenient to stand an watch a print. But what happens if you put some slack on the filament? When you have an AMS LITE that in effect equals a push pull extruder system. so there should be very little tension of the filament in the tube if all is working correctly.
There is a screw on the side of the extruder to adjust tension. Another thing to look at is the extruder and check the condition. That is supposed to be a hardened extruder, that’s fine for carbon fiber and abrasives, but maybe it’s to hard for softer filaments.
Just a couple thoughts.
M1
Hey, the screw tension is at the factory setting - which is screw wound all the way in (max grip). The gears I haven’t checked but this is a very new printer - less than 100h printing, and mostly TPU and PLA basic, so I think the gears should be fine, I don’t want to open it up right now.
If I stand there and push the filament in to the PTFE tube constantly, I think it will print (I’m not sure that that is what the AMS lite does). But I would be standing there for hours and hours!!!
Omg I didn’t know this was a single gear extruder! (Of course I should have noticed that there is gripping marks on one side of the filament)
Very small amount of experimenting says, yes, taking tension off of the filament probably helps, but, so? It only verifies what I know already, additional drag/tension of the AMS is a problem. Since I moved to only using the external spool for matte, I have had zero issues, not one single failure.
On my A1, the extruder gear tension was set at absolute full max from the factory. It took a bit of effort to loosen the screw. I did back it off some, but it didn’t seem to affect anything. Backing off more might help, but I don’t have the time or desire to screw around with it, since failure may or may not happen, and if it does, it’s usually an hour or more into the print. It would take running a ton of prints to truly work out any possible improvements. If I wanted that, I could have bought an Ender. Just easier to put the spool on the external. I’ve got my AMS set right now to only use three positions, so I can leave the external spool hooked up.
Note to BL, the AMS is great, but you REALLY should leave a path for the external spool without having to connect/disconnect things. It’s even worse for the P1/X1 folks.
I just tried this in my P1S with AMS to see if I can extrude it. I have never had AMS issues and I’m using a 1 month old AMS here. With this filament, I’m getting both retract and load errors. The feeder gears really grind it up because it can’t get a good grip. Now my AMS tubes are full of red and blue dust so I’m gonna need to take it apart and clean it so it doesn’t contaminate the lighter colours. This is so annoying…
The measurement is from a new section, not the ground up section.
As an aside, the layer adhesion is very poor, even increasing the temp to 235 and lowering the max flowrate to 4 and printing directly from a filament dryer:
And bridging infill, even if it’s straight on top of solid infill, will not stick at all:
I think that filamet is BAD, but if you want to print it you can try these mod! i made for flexible I am shore that will help!
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hey everyone! P1S user here,
just bought two rolls of dual color Silk from amazon, brand is AMOLEN.
thought it was my AMS at first since my first slot has been having issues, then cleared the clog and used my second slot with another filament of the same brand, and bam, clogg again.
havent gotten into opening up the extruder, etc. got some bambu brand filament coming, hope that goes well.
but just to confirm im getting silk dual color problems in my p1s as is many people here
Brand new A1 mini user here. I bought a selection of filaments with the initial order and when I finally went to try the dual color silk, no go. Printer happily prints any other filament I have from any AMS lite position, dual color is hated by all.
I’m glad I found this post, and then my calipers. Oval cross section confirmed on my spool of blue-magenta silk ordered on March 31st.
Question, as I’m new to all of this: is this a production quality issue (the filament is intended to be circular, but is not) or a printer issue (the filament is expected to be oval, and the printer should be able to handle it and isn’t?
In case this helps in any way.
I have never used BL dual colour filaments or otherwise, but, I have used other brands dual and triple colour silk and standard filaments and they have all worked without fault on my A1 and A1 mini.
The dual silk is supposed to be slightly oval. Per customer service when I opened a ticket:
“To ensure that the filament does not rotate during the printing process and thus provide the dual-colour effect, the filament of PLA Silk Dual Color is designed to be oval instead of circular; that is, its average diameter is 1.75 mm, and the actual value is mainly in the range of 1.60 mm to 1.85 mm.”
However, my measurements showed 1.8mm by 1.5mm. Sent video of it failing to load and received a refund. I will try a different dual-color brand in future but all other Bambu filaments work for me, no issue. May be a defective batch.
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I am having the same issue today with a brand new .4 hardened nozzle, for the life of me I cannot get it to work. I might try a .6 nozzle just to see what happens, but it’s so sad that the quality checks are not tough enough that it makes this unusable with .4 nozzle.
I had the same problems after printing Dual Silk Filament. I never got this unhardened nozzle clean again.
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