Further, Figures show a range of intricate printed structures, including a Klein bottle with a fine mesh surface and a gyroid geometry to illustrate the excellent printability. In both cases the structures exhibit high resolutions of small features without over-polymerization. To demonstrate the high xy-resolution, the Heidelberg University seal, containing a complex engraved image with feature sizes below 100 µm, was printed with the ELMA ink formulation (Figure ). Further details of the distinct features were imaged using a light microscope (see images in SI Figure ). To further analyze the photopolymerization taking place during printing, the degree of double bond conversion (DOC) was calculated from FTIR spectra (SI Figures ). The DOC values for the three lactate ester-derived polymers lie within the range of 76 -86%, which is in accordance with values observed in literature for 3D printed samples. Specifically, the DOC was calculated to be 86% for the MeLMA formulation, 76% for ELMA, and 79% for BuLMA. To gain further insights on the effect of the different alkyl lengths incorporated in the bio-based monomers of the formulation, the thermomechanical properties of the printed structures were analyzed by way of dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) (SI Figures ). The storage modulus in the glassy state was found to be 1.78 GPa for MeLMA, 1.62 GPa for ELMA and 1.08 GPa for BuLMA at 25 °C. The decrease in the storage modulus may stem from the alkyl chains acting as plasticizers, leading to softer materials with increasing chain lengths. Overall, these values for the storage modulus are comparable to other thermosetting bio-based methacrylate inks containing vanillin-and eugenolbased monomers. The glass transition temperatures Tg were determined at the maxima of tan(d) (SI to the alkyl chains acting as plasticizers. Analysis of the thermal stability of the printed structures through TGA measurements showed that the polymers are stable up to at least 180 °C. Please refer to the SI for further details.