After wrapping the plastic with kapton tape (wrap counter ... this scientific approach to annealing plastics used in 3D printing might come in handy.

Additionally, annealing enabled self-healing capabilities, where damaged components could be repaired with no loss in functionality. In tests, a cut sample of the printed plastic was rejoined ...

[Karl Lew]’s wiki page on PLA annealing sums up the important parts ... minutes at 160°F/71°C water using double air-evacuated plastic bags (e.g., Ziploc). In this case, we are making use ...

They also demonstrated the printer's ability to produce complex and multi-layered structures including a tiny plastic vase ...