Cupholder Accessory Mount Base

Solid and through-hole accessory-mount bases remixed from a W212 cupholder phone-rest geometry and physically shown carrying a suction-mounted display. The author recommends PETG or stronger infill rather than the PLA lightning-infill prototype. Match the cupholder and accessory footprint, use cabin-heat-resistant material and suitable adhesive, and prove the mounted device cannot obscure controls, airbags or the road, overload the cupholder, or detach under braking.