10.23 ± 0.44 MPa, 11.87 ± 0.09 MPa and 9.09 ± 0.77 MPa (Figure ). This 5-fold overestimation highlights the influence of adhesion forces between the indenter tip and the surface of the elastomers on the measured values, which if unaccounted for, lead to a significant overestimation of the mechanical properties. For the inks prepared using 2-ITX as photoinitiator To further verify the method, the optimized protocol was applied to measure the modulus of a commercial reference, IP-PDMS (Nanoscribe GmbH & Co. KG), a 2PLP PDMDS based printing material known to be adhesive. The optimized protocol yielded a reduced modulus of 2.46 ± 0.13 MPa, whereas when employing the 'standard' procedure, the modulus was estimated to be 21.99 ± 0.59 MPa-an order of magnitude difference. The reported literature stiffness values for IP-PDMS structures under comparable printing conditions range from 5-11 MPa . And although these values, obtained using different geometries, they are still 2-5 fold larger than measured using a protocol that is suitable to soft and tacky 3D printed microscale materials.