Question: whats the coolest thing you've 3d printed and whats a catalyst?

Anthony Newell answered on 11 Mar 2020:

The coolest thing was an assembly of gears I printed which could be printed all in one go. I don’t know how you could build it another way if you didn’t use 3D printing.

A catalyst is a material which makes a reaction go faster. I was making an aluminum catalyst for a hydrogen generation reaction. We wanted to get the most hydrogen as quickly as possible because we wanted to see if it could be used for powering electric cars.