Annealing effect on 3D printing

A first approach to study the thermal annealing effect of an object made of Poly-lactic Acid (PLA) produced by Fused Deposition Modeling (FDM) technology

Producing the samples

Delta Atlas 4030

Water absoprtion test

Dimension variation


Differential Scanning Calorimetry

Annealing process

Convection oven

Thermal annealing is a common process used mostly for injection moulding and currently being applied to 3D printed components based on extensive studies about the chemical and mechanical behaviour of polymers submitted under a thermal treatment, nevertheless the studies made so far lack a systematic approach that can enrich the rapid growing world of additive manufacturing.

The project was inspired by the current maker movement that is exploring various post-processes as a method for adding value to 3D printed components and the market which is providing solutions in the similar directions.

This study is a first approach to evaluate the annealing effect on the physical structure of an object made of Poly-Lactic Acid (PLA) and obtained by Fused Deposition Modeling (FDM) technology. Differential Scanning Calorimetry test and tensile test were thus performed to measure the PLA crystallinity degree, the apparent tensile modulus and strength before and after the thermal annealing.


Jennifer Monclou


Claudia Marano

Riccardo Gatti