“Brittle” PLA prints - layers not sticking together. Printrbot Simple w/ aluminum extruder and bed.
A number of my recent prints seem to be brittle. Since I changed too many parameters, I’m looking for wisdom of the crowd to help narrow my troubleshooting
The symptoms are:
a) sticking harder to the tape on the bed and therefore breaking when removing.
b) when printing a tube that is narrowing, sometimes the filament doesn’t stick to the previous layer and strings across the gap
c) basic destructive tests show that final product breaks / separates at layers with surprising ease.
Variables that changed:
- ran out of white PLA, switched to blue (seems to be more translucent)
- switch host OS (from XP to Ubuntu) which led to
- switched slicer from Slic3r to KISSlicer which led to
- different parameters - potentially many differences, but 2 major differences are
4.1) lower printing temperature (185 at first, now 190 vs 200)
4.2) slower printing speed (haven’t studied where the speed is in the slicer configs, but elapse time is close to 50% longer)