MPa. Comparative analysis using a 'standard' nanoindentation protocol-which uses a Berkovich indenter tip, an unmodified trapezoidal load function and OP model for data analysisrevealed that traditional methods lead to a significant overestimation of the elastic modulus by up to an order of magnitude because they do not take adhesion into account. The known influence of adhesion forces on nanoindentation measurements on 3D printed soft materials has been overlooked. One reason is that adhesion appears as a negative load during unloading in a experiments. Furthermore, conventionally used models, like the Hertzian contact theory or the OP method assume negligible adhesion, leading to a systematic overestimation of the elastic modulus in such cases.