Why is Slic3r printing some parts 100% instead of honeycombed?

[printbus]

I'm not sure if this is your issue, but look for the Slic3r "solid infill threshold area" setting that at least used to be under print settings | advanced. The comment for that field is "Force solid infill for regions having a smaller area less than the specified threshold". Something to experiment with, anyway.

[Claptrap]

I'm not sure if this is your issue, but look for the Slic3r "solid infill threshold area" setting that at least used to be under print settings | advanced. The comment for that field is "Force solid infill for regions having a smaller area less than the specified threshold". Something to experiment with, anyway.

I found the Solid Infill Threashold Area field, set at 70 mm squared. I'll have to play around with it and see for sure, but I bet you solved my exact question. Thanks!