I have an A1 Mini with 308 hours print time. The AMS lite is a month or so newer.
I printed the same object 5 times. The first was sent from Bambu Studio. The next 4 were printed from the saved file on the SD card.
The last print shows what I think is under extrusion on the top. The top of the print consists of a solid green layers, then a single layer of white then a single layer of red (text) and white for the image and border.
The green and white filaments are Bambu Lab PLA Basic. The red is eSun PLA+.
There were no error messages from the printer and no spaghetti. There are multiple colors on the bottom of the print and they look okay. I did a quick print of the small scraper from the stock SD card in both red and white and they both came out okay. I have a whole house power monitor and it didn’t report any power issues during the print time.
I think if you repeat a print from SD the dynamic flow step at the start is missed.
1 Like
Also, it looks to me that the sparse infill is the one causing the issue. Try to help bridging and try more layers on top.
Thanks for the reply. Sparse infill was causing me a problem on previous test prints, so I added some more solid layers (using a height range modifier to set infill to 100% - is there another way) until the print cleared up. The print currently uses about 4 solid layers.
I printed 4 of the same print with no problem (good picture) then the fifth failed.
1 Like
Thanks,
That’s something I hadn’t realized. I usually deselect flow dynamics calibration when I print. Somewhere I read that it wasn’t needed or actually had side effects when used with PLA and the textured PEI plate. Is that something I should be doing?
Also, I successfully printed 3 copies from the SD card before I got the failed one.
1 Like
I think its best to use if you haven’t done a Flow Dynamic calibration on your filaments as it’ll use that if auto is deselected, if enabled it will use the auto value at start of print.
Are you saying select it the first time you use a new filament, then leave it off until you replace the filament?
Does anyone know if the calibration is saved for different RFID chips in the Bambu Labs filament spools? For example, if I do a flow calibration for a spool and then change the filament and recalibrate, and then remount the first spool, does it use the original spool’s calibration?
Auto at the start will use the value used once done with every print if enabled, if disabled it will use the default (0.00) or saved value from manual calibrating.
If you calibrate a spool that has a RFID tag, when detected, it will use custom one if one has been set and the auto is disabled before print, if enabled it will use the current value for that filament using the info from the RFID tag.
It looks like you are using a very low percentage of infill and grid style.
You should share your settings to confirm one way or the other.
If my infill guess is correct, you should use a larger infill percentage as your first four seem more like luck as anything goes wrong elsewhere and it becomes more less forgiving.
I would suggest using something other than grid infill, gyroid tends to work well in most circumstances.
I was using 5% infill either Rectilinear, Cubic or or Support Cubic (I got the idea for Support Cubic or Cubic from a Maker’s Muse YouTube video).
What is interesting to me is that that same setting (5% Rectilinear) worked fine for several prints. There were four successful identical prints right before the failure, and before that, several similar prints with the same setup.
The previous change to the print setup was to increase the number of solid (100%) infill layers at the top of the print. Before increasing them, I had prints where the infill pattern showed up, but never an under extrusion like on the failed print. I kept increasing the layers until I got a good top surface. I made several prints with that setup that were all fine, then this failure. As I said the print before this (saved on the A1 Mini’s SD card) was fine. I did the failed print using the same file from the SD card.
