Wow, that's a big 3d printer! (If you've ever printed spaghetti on a smaller 3d printer then you know)

The sheath deals with that. Friction/screw tension makes it harder too. You're right though, there is no lock to keep it closed if it's not enclosed somehow.

You can change quite a lot (pivot & blade are original)

Proteins are made from amino acids, same as words are made from letters. If you eat a protein source that's short on some of those letters then you need to mix it with a source that has more of them... Otherwise you can't create all the proteins that you need. (It's a bit more complicated, but that's the bit that you need here)

I miss the "swipe to punctuation" from Swype. Typically, "w-e-.-l-l" to prompt "we'll" instead of "well". The other thing is the long press option on the main keyboard only has one alternate character. The secondary keyboard has more. I like it, use it as my daily driver & I'd recommend it.

Fairemail (https://github.com/M66B/FairEmail) is an excellent email app alternative. With a responsive dev too

Have you done any calibration, or just gone straight to printing?

That's the speed of lightning in a vacuum, the speed of lightning in a dojo is significantly slower. In fact scientists believe that it can be brought to a crawl visible to normal human vision using a Tai Chi doping process. (Vacuum: Yes, i know)