Lego Mindstorm / Technic Part Designer
thingiverse
As the customizer isn't working right now, please visit https://www.aposteriori.com.sg/lego-mindstorm-part-builder/ to design your Lego Mindstorm / Technic parts. Unlike other existing Lego part customizer, this one allows you to easily design (almost) any shapes and configurations. The uploaded STL shows some of the example parts that were designed using this tool. I've also uploaded a SCAD file. This is an earlier version that I created, and it's largely identical to the web-app version.
With this file you will be able to print Lego Mindstorm / Technic Part Designer with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Lego Mindstorm / Technic Part Designer.