As long as your 3d printer is dialed in with respect to size and extrusion, you stick with the recommended PLA filament, and you use temps that get you proper bonding between the layers, the recommended print settings should get you parts that are adequately robust. That’s why they’re the recommended settings 
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Many folks find they have some fine tuning of the printer to do if they haven’t tried printing parts engineered for tight tolerances. Squareness issues are not uncommon. Check out the Printer Tests and Calibration topic if you’re looking to ensure your printer is up to the task.