Earlier quoted context omitted.
Why though. You need to physically buy Legos for this project. It's not like their showing how to print Legos
Not to be that person, but it's 'LEGO', whether singular or plural. I used to work for LEGO and they would take this really seriously. Similar to 'deer', one LEGO brick is one LEGO brick. A pile of LEGO bricks is still a pile of LEGO bricks. :) https://twitter.com/lego_group/status/842115345280294912
In the US, I've never actually heard someone use the "correct" plural, everyone just says "Legos", which makes it reasonably correct IMO. That said, I've heard "LEGO" plural occasionally in Europe, more people seem to care across the pond.