I am trying to print my first project which is a carburetor bellmouth, it starts off ok then after a few minutes the print head makes a noise and shifts off centre which ruins the print. I have tried many settings but has made no difference, happens every time. I am using engineering plate, 0.6 nozzle, have cleaned the rods, no debris, adjusted the belts, no change. I tried to print the same file in pla and no problem! Any ideas? Can’t upload photos says error try again every time
As a “basic user” you should be able to post pictures as you can post threads. The problem could be that the pictures are too large to upload and it will give an error. Try reducing the size?
You are probably loosing the layer bond due to the curvature and thickness of the area.
Try to slice with variable layer height and/or reduce the speed a bit more.
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Thanks for the reply, I have tried to print just a plain tube and it still does it, have also slowed it down quite a bit, but will try what you suggest, fingers crossed! I might also try printing a box to see what results I get.
Hi, I’m looking for solutions to the same problem.
I have the same problem when printing with PAHT-CF as well, and reducing the speed doesn’t solve the problem.
Yep tried many different variations on settings, nothing has any effect, very strange. It’s the reason I bought this printer to print these materials, very poor
I will assumem the filament is dry. This filament will not print well if not.
Secondly try a .6 nozzle. Sometimes .4 can get clogged easily with the .4.
Yes, dried 80 degrees 8 hrs, 0.6 nozzle, seems to me it’s a printer problem not filament, as the print head literally jumps off centre more than 10mm, and the sound it makes sounds like the belts have slipped, can’t be worn as it’s almost new, I have tried adjusting the belts although they didn’t need it.
Crossed my replies. I’ve read this twice and finally see that there are two “userxxxxxx”. I’ll be back when they have names to make it easier.
You have something interfering. I doubt it’s the belts but it’s not doing them any good. I assume you’re saying the plate moves 10mm? If it’s the print head is it moving left right front back?
Youre definiton of jump may be different than mine and I want to understad
It’s the head that’s moving/changing position randomly , if i leave it running it will keep happening , but up to the first occurrence , which is between 25-50% of the print time it’s printing normally
Hi there,
I had the exact same issue on a brand new X1E recently. The cause was out of spec carbon rods. It would print low temp filament (PLA, PETG) perfectly but any higher temp filaments led to the same loss of position/step loss.
Basically as the rods get hot they expand and if they are out of spec it leads to binding/abnormal resistance of the tool head/hotend. This then overloads steppers, leading to step loss.
Contact Bambu support (or your authorized reseller if that applies to you)
Do the rod cleaning and belt tension steps as per the wiki that they will ask you to do.
Then they sent some custom g-code to run which measured a bunch of frequencies in the machine. After exporting and sending the machine logs back to them they confirmed it was the carbon rods.
Bambu ended up replacing the entire X axis assembly.
I have put 2000h on it since replacement, no issues. Mostly printing PA6 CF, PA12 CF and PET-CF derivatives.
I hope that this helps you 
That is very useful information, thanks very much, I have already a ticket so we will see what happens
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Thank you for the information, I will open a ticket 
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