One can improve things, often talked about but usually never implemented!

What I am always amazed about is the original idea & often just how complex the device was to get it to work in the first place.

I remember someone showing me this plastic part in the 1980s & asked how it was made. I couldn't work it out, it just did not make sense. Then they told me it was printed, & in Brookvale in Sydney. They explained the process, then the finished part made sense. 3d printing has been around awhile!