Gravity Knife Print in Place

I saw some models of gravity knifes which I quite liked. 
But they all required assembly, and I'm bad at assembling things. 
For this reason I've designed this model, which is print in place and doesn't require any assembly.

For the print orientation, rotate the model by 90 degrees and print it upright, as seen in the 4th picture.
It's possible that some parts bind together, you might need some force to get everything to move correctly. 
For the knife you might need to push the blade out using the two knobs at the side and applying some force.

This is a toy, please don't modify it in any way, that could make it a weapon.