The opto-mechanical system of MAS 2.0 can be seen in the renderings in Figure . The main structural elements of the relay are four 26 mm diameter Invar rods spanning the length of the system. At the distal end, these are connected to the support for the back lens and mirror. A very similar support, for the front lens, also connects the rods. Additionally, two L-shaped supports connect the rods at the reaction chamber end. One of these L-shaped structures supports the DMD mount and DMD, while the other supports the reaction chamber mounting system. Coupling of all of these to the baseplate (Figure ) is mediated by two cross elements that connect to the bottom two Invar rods and additionally to the base plate. To decouple thermal expansion of the stainless steel baseplate from the Invar rods, only one end of the baseplate is rigidly attached to the relay structure, with the other end connected via a flexible linkage visible in Figure -22. The relay optical elements, including the fold mirror, DMD and reaction flow cell, are adjustable via kinematic coupling fixtures. In the case of the front lens and back lens and mirror, they are Maxwell kinematic couplings consisting of three V-shaped grooves arranged at 120° that engage with three ball-tipped precision adjustment screws (not shown) to provide sub-micron positioning accuracy . The DMD and the reaction flow cell use Kelvin-type couplings with high-resolution micrometer actuators to allow precise positioning at defined positions. This positioning is needed in the initial system alignment and additionally enables efficient DMD swapping as well as reproducible changes to the flow cell position to accommodate diverse experimental settings, e.g., reversing the reaction flow cell to enable synthesis on opaque substrates (vide infra), or defined defocusing to blend adjacent synthesis areas.