PET bottle shredder

Trying to make mini shredder for PET bottles. Tested a lot of models, but failed.
So finally made the one by myself. And this model really works!
Basically it works only with A-part, but you can use B to be safer.
Print parts as there are orientated in STL files. You will also need 2 M4×10mm bolts to fix the blade inside. Hole at the B part could be used to mount the bottle holder shaft, but I don't use it.
Spool could be useful also: https://www.printables.com/model/396145-spool
And check a “makes” for details. 

Update: “N” version added. I found it more usable.