3DBenchy
The 3DBenchy is a 3D computer model specifically designed for testing the accuracy and capabilities of 3D printers. The 3DBenchy is described by its creator, Creative Tools, as "the jolly 3D printing torture-test" and was released (STL only) in April 2015, with a multi-part, multi-color model released in July 2015. While the model is free to download, use, and redistribute with attribution, it is not open source, as the authors have not released the source code, and do not allow modifications. Due to its status as a common benchmark, it is believed to be the world 's most 3D printed object. The model itself is a freelanced tugboat design, and actually floats in water given the right conditions in printing. Use. The 3DBenchy is often used to test and benchmark 3D printers when they are reviewed, as the model includes a number of difficult-to-print features including: symmetry, overhanging curved surfaces, smooth surfaces, planar horizontal faces, large, small and slanted holes, low-slope-surfaces, first layer details and tiny surface details. The 3DBenchy is designed to be measured from specific points to ensure accurate printing including dimensional accuracy, warping, deviations and tolerances and it has  a relatively short printing time of around 1 hour. The multi-material 3DBenchy is created for 3D printers capable of printing in multiple materials or colours, the model consists of 17 individual files which can each have different settings applied to them. The 3DBenchy is free to download and is available under the "Attribution-NoDerivatives" Creative Commons 4.0 License, meaning it can be shared, but not altered by anyone other than for personal use. In 2020 physicists at Leiden University in the Netherlands created a 3DBenchy around 40μm long using the group's Nanoscribe Photonic Professional printer.