Hi Everyone,
I made a web-based designer for custom Mindstorm / Technic parts that you can 3D Print. This was initially created to enable my students to easily create custom parts for their robot participating in the RoboCup Junior competition, but I figured it'll be good to share it with everyone.
https://www.aposteriori.com.sg/lego-mindstorm-part-builder/
It's nowhere near as nice as the original factory-made parts, but it can be useful when just can't find the right part to do the job.