Opt Engineering is a print service which is located in Bavaria, DE. The vendor works with PLA, Z-PETG, Z-ABS, Z-ASA Pro in different colors. Our test part was printed in Red Metallic PLA. The results came out exactly as expected. The surface finish is smooth with no rough edges. All the fine elements and tricky bridges on the top of the model are solid and came out with the required precision. We were pleased with the quality and short turnaround time.