Elegoo Matte PLA profile under-extruding (flow 0.768?) – A1 0.8, vase mode

Bambu Lab Software Bambu Studio
1

Hi everyone,

I bought an Elegoo Matte PLA filament profile online and I’m not happy with the results: the prints come out clearly under-extruded (thin, weak walls). I’d like to hear your opinion on the profile and ask what you use for a case like mine.

My setup

  • Bambu Lab A1 + AMS lite, 0.8 mm nozzle (standard flow)
  • Elegoo PLA Matte 1.75 mm, dried in a filament dryer before printing
  • Everything is printed in spiral vase mode (decorative vases, single wall)
  • Bambu Studio [version]

Main settings of the profile (screenshots attached)

  • Flow ratio: 0.7683
  • Nozzle: 220 °C (all layers)
  • Textured PEI plate: 65 °C
  • Max volumetric speed: 14 mm³/s
  • Density: 1.32 g/cm³
  • Fan: min 60% / max 80%, min layer time 80 s, slow down for cooling ON
  • Retraction overrides: only “length when change hotend” 14 mm and long retraction when cut 18 mm

Questions

  1. Isn’t a flow ratio of 0.7683 way too low for PLA? Could this alone explain the under-extrusion?
  2. For vase mode with a 0.8 nozzle, would you start from the stock “Generic PLA” / “Bambu PLA Matte” profile and just calibrate flow + pressure advance, instead of using a bought profile?
  3. Is there a “go-to” profile or recommended values for Elegoo Matte PLA on an A1 with a 0.8 nozzle (temperature, flow, max volumetric speed)?
  4. Anything specific to vase mode I should change in the filament profile (cooling, volumetric speed)?

Thanks in advance!

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2

That flow ratio is quite low, in my opinion.

It may be the case that for a 0.4 mm nozzle, some of the other settings they’ve changed mask the effect of that very low flow ratio setting, and it may work just fine for 0.4mm nozzles, but wouldn’t work for other sizes.

I would start with either the Bambu or generic matte PLA filament profile, and then run this test to determine the absolute maximum the printer can achieve with the 0.8 nozzle - this establishes an upper limit to print speed, so we can make sure any tuning that happens is being applied to a print speed that the printer can actually support.