As you see in the photos, the Eiffel Tower and the Bird's Nest Olympic Stadium are not much bigger than a match head. They are printed with SLA Microscopic Resin, which can achieve an ultra-high printing resolution (2碌m-50碌m) and printing tolerance(卤5-25碌m). They are usually applied in the electronics industry.
Solution
Micro 3D printing process is based on stereolithography (SLA) in which successive layers of photocurable resin are selectively solidified by targeted UV light to fabricate 3D objects.
Each process variant differentiates itself by its source of UV light (laser beam or DLP projector), system layout, and special features deployed to reach micro resolution and tolerances.
Projection Micro Stereolithography (P碌SL) printing is similar to common SLA printing processes, also including supports adding, light curing, cleaning, post-curing and polishing.