Have you tried increasing the print temperature? PLA prints at 200, but its not very strong at that. I tend to print at 205 most of the time, and if I want something extra strong I'll drop the speed to 40mm/s and increase temperature to 210-220 depending on the filament. Steadytech is nice and strong at 210-215. Protopasta HTPLA can print at up to 250 for max strength according to their web site, but the CR-10 will melt if you go that high!
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