Hi everyone,

I'm getting tree supports crumbling into small debris mid-print on my Bambu H2D + 0.2 mm nozzle at 0.08 mm layer height (also tried 0.06mm). In my last print central parts fail with blobs/stringing while sides print fine (see video)

Current profile with what is changed or important from bambu default

Quality

• Layer height: 0.08 mm
• Wall generator: Classic
• Precision: Slice gap 0.001 / Resolution 0.001
• Avoid crossing wall + support: ON

Speed

• Outer Wall : 50 mm/s
• Inner Wall : 50 mm/s
• Support : 40 mm/s
• Travel : 500 mm/s
• Top Surface : 50 mm/s
• Bridge : 15 mm/s
• Initial Layer : 25 mm/s
• Overhang Speed : Activé (30 / 25 / 15 / 5 / 5 mm/s selon les %)

Accelerations

• Normal printing : 3000 mm/s²
• Travel : 5000 mm/s²
• Outer Wall : 2500 mm/s²
• Initial Layer : 250 mm/s²
• Top Surface : 500 mm/s²

Supports

• Type: Tree (Auto)
• Base Pattern: Rectilinear
• Base Pattern Spacing: 1.6 mm
• Top Z Distance: 0.18 mm
• Tree Support: Branch diameter 2 mm / Branch angle 60°
• Support Line Width: 0.28 mm
• Brim: 9 mm

Other / Calibrations

• Wall loops: 4
• Infill: 25% Gyroid
• Bambu glue stick for bed adhesion
• Flow calibration + Dynamic Flow Calibration done (K=0.02)
• Z-hop: 0.6 mm with spiral travel

Questions

I am a bit lost to what I should do or test actually, already read some messages from this subreddit, this is why I increased Z-hop or activated avoid crossing walls, with those I got from supports always knocked to support breacking but I can go further on my prints in general. On 0.4mm nozzle I have no issues at all. I have 3 different 0.2 nozzles that I tried to be sure this was not nozzle related. Any help appreciated :)