Anyone else having issues with the newest Cura’s infill. I’m getting air bubbles that even pop at 25% infill and .6 top/bottom layer thickness for the top layer on flag surfaces… .8 shell. The new infill is like the slightly older support was. Mid that support was like removing a sponge. I’m not sure how I feel about the infill method yet.
Bubbles are likely to be from damp filament. What material are you using?
I haven’t used the latest version. What did they change?
The infill style is different. The filament is rep rapper orange. I only see this happen for the top of the infilled flat areas.
@D_Rob what is the actual material? PLA, ABS, other?
Most plastics tend to absorb a small amount of moisture from the atmosphere. When this is heated to 200 degrees it is released from the material as steam, leaving the bubbles you are seeing.
Can you get your filament dried out and try again?
put it in a sealed bag with some desiccant sachets and put it somewhere warm over night.
ABS and its fresh out of a bag with desiccants.
I increased the top and bottom thickness to 1mm instead of the .8 and increased the infill to above 35 and this went away. I sacrificed the offending prints and broke them. I honestly believe this is due to to the infill and a thin top shell. all other prints with higher infill and/or thicker top layers don’t show the bubbles. While watching the prints I see the first solid layer sink into the infill and then the pressure of the hot air inside the infill area bubbles the thin top layers while they are still hot. I guess if I want low infill I need thicker top layers. This holds true for the inverse. If I have higher infill I can use thinner top layers. I will try with a different abs at the same settings and see if this is consistent if it is it may be a new issue with the new cura. I am using all of the same settings as the older version I was on but I swapped filament for the first print.
Yep. I’ve seen the same problem. Cura seems to be doing bad flow rate maths on those first solid layers as it needs to treat them as bridges. This is a common issue with Kiss and ABS IME. Try the version in the Github repo. Daid often includes bug fixes in the the latest pre release builds.
@Tim_Rastall thanks Tim. I am still finishing my machine but feel its near the maiden voyage. I’ve seen in other machines driven with spectra do figure 8 wraps then tie to itself instead of a belt I am going to experiment with this. if I can do it with no slipping I wont need gears nor expensive closed loop belts