Fused Deposition Modelling (FDM) is the technologies to build complex 3D prototypes directly from a computerized solid model. In this process, the model is built as a layer-by-layer deposition of a feedstock wire. The most important issues in the FDM process is the twisting of the part during the printing. This issue is due to the rapid heating and cooling cycles of the feedstock material that could produce accumulation of residual stress during part building up. The purpose is to measure the residual stress in FDM parts made of ABS employing the hole-drilling method. In order to avoid the local reinforcement of the strain gage, an optical technique, i.e. ESPI (electronic speckle pattern interferometry), is introduced to measure the displacement of the surface due to the stress relaxation. The effect of the stacking sequence and the residual stress distribution on each side of the specimen is interesting.