Duplo compatible bricks - pick your own size

thingiverse

Duplo-compatible bricks in various sizes are provided with the included STL, including 2x2, 4x2, 6x2, and 2x2 (double height) bricks. The SCAD file allows you to customize your preferred dimensions quickly. These printable Duplo bricks have an internal support structure for hassle-free printing without additional supporting materials. The central cylinder is notched for better flexibility with less elastic plastics than ABS. Precise stud and ridge dimensions were adjusted for compatibility with original Duplos, but users may find slight adjustments of dimensional parameters (ridge width and stud radius) yield better results. Note that in September 2018, some users experienced suboptimal results that could be due to potentially inaccurate dimensions; it's recommended to test a single brick before printing multiple bricks. A November 2019 update removed STL files as some users with more accurate printers reported wrong dimensions; only the openSCAD source remains for those wishing to create their perfect STL.