<p>I recall seeing that it's possible to &quot;bake&quot; or &quot;anneal&quot; or even &quot;remelt&quot; PLA prints to strengthen them.  As I understand it, the main effect is improving layer adhesion, which is the main source of weakness in tension in the original Z-axis direction.</p>
<p>Yes, I can print with a hotter nozzle (up to a point) to increase layer adhesion, print with a larger nozzle orifice, print with increased layer height, print slower -- but at a minimum those require reslicing, and affect print appearance (hotter nozzle causes stringing, thicker layers are more visible, etc.).</p>
<p>Baking a print does none of that, as long as it's supported (often done by bedding it in salt).</p>
<p><strong>Question is, how hot?</strong>  I presume I don't want to go all the way to printing temperature of 180-220 °C, but the plastic transition level of roundly 50 °C isn't hot enough for this.</p>

I've only annealed PEEK personally, but a quick search returns varying recommendations:
All3DP
recommends 1 hour at 70 °C.
X3D
recommends 1 hour at 110 °C.
Matterhackers
recommends 10 minutes at 105 °C for Tough PLA or HTPLA.
A post on
Reddit
recommends "a few hours" at 110 °C.
I'd do a test suite with pieces at 70 °, 90 °, and 110 °C for an hour each and test/compare.
Be mindful of any chemicals that might be released.