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Thank you for the well thought out video and relevant data.

I thought this might be of interest to you... I just watched this video by Thomas Sanladerer, where he does some initial testing with materials strength and stiffness after annealing a few different plastics including PLA. Albeit there was some shrinkage/expansion, he obtained about 40% increase in strength and 25% in stiffness after baking plain PLA for 1 hour at 110*C. He covers his methodology and shows snapshots of the tests.

https://youtu.be/CZX8eHC7fws