Excellent design! Tested on a few hazelnuts, walnuts and almonds no problems.
I sanded the body a bit as my slicer settings lead to some banding, applied candle wax to the plunger (read: I rubbed a candle along the screw a few times!) and put some UHU glue in the handle hole before banging the plunger into place; I doubt that'll move.
I feel its a bit over-engineered leading to the 13 hour print time.
4 top/bottom shells
plunger: 5h1m (with brim)