The diluent indeed represents a key component to optimizing the viscosity of the resin, however, it also influences the mechanical properties of the solid, cured, product. The objective of these tests is to determine which formulation allows at the same time to decrease the viscosity of the MEMO and obtain optimal mechanical properties. For each formulation, 5 samples were tested and the results obtained are shown below ( From the measurement, we calculated the E-Modulus, the stress-max, and the elongation at break for all the formulations. The E-Modulus is a measure of the stiffness of a material, the stress-max is a measure of how strong a material is, and the elongation at break represents the elongation of the sample before the rupture and it is a measure of the elasticity of the material. All the samples tested showed good elastic behavior, higher in the samples obtained with MEMO_1 due to the lower degree of modification. On the other hand, the samples from MEMO_2 were stiffer and more robust. The formulations tested showed higher values of the E-Modulus, the stress-max, and the elongation at break when the IBOMA increased up to 40%. The presence of a certain percentage of the diluent helps to stabilize the structure of the cured products. However, increasing the IBOMA up to 50% and 60%, MEMO_1 samples were too brittle to be tested and the samples from MEMO_2 showed a decrease in stress-max and elongation at break and an increase of the E-Modulus. This behavior can be explained by considering the influence of the IBOMA properties on the samples. With higher concentrations of diluent, the small dimensions of the molecule and the single methacrylic group can cause polymerization without creating a 3D network between different chains. This results in more bonds (higher E-Modulus) but between small isolated molecules, making the material more fragile and brittle. Between the formulation analyzed, MEMO_2_60 (60% MEMO obtained with 2% TPP, 40% IBOMA, and 2% BAPO) showed promising properties, with an E-Modulus and stress-max lower than the control, but with the elongation at break value between 2 and 3 times higher than the control. The opportunity to have a more elastic 3D printed material can help while working with objects that need to be stretched without breaking. Considering the results obtained, MEMO_2_60 was selected for application in stereolithographic 3D printing. mSLA 3D printing. To find the ideal printing settings, we tested varying bottom exposure time and exposure time per layer. We started observing the printability of our resins from 50 s of exposure time per layer for design without complex architecture, where the printed object before the post-curing step showed a gel-like behavior due to the incomplete polymerization of the sample (Figure ). Despite this, we were able to achieve for both negative and positive features with high levels of details, with a negative line thickness of 200 microns (almost 2 pixels in the mSLA printer used). We decided to test our resin also with more complex 3D designs by printing a rook and an SLA printing test. To obtain good stability of the printed object we had to increase the exposure time from 50 s up to 90 s, achieving a more complete polymerization (Figure ). Also with these settings, the printed designs showed good stability and a high level of detail. All the printing tests have been conducted on the Lite3DP Gen 2 printer, which has smaller dimensions but also a less powerful LED source than most of the printers available on the market.