Annealing PLA
Depending on the application sometimes you need to anneal your PLA part to make it stronger. Annealing PLA is done by putting the part(s) in an oven that has been heated to a few degrees less than the melting point of the PLA used. Place the part(s) in the oven and turn the heat off and let the part(s) cool to room temperature which will take an hour or more.
Steps:
Preheat oven to 200 degrees (see above)
Place the part(s) in the oven
Turn oven off
Let it cool to room temperature