For instructions on how to finish the Shell see https://makerstevecom.wordpress.com/2018/03/26/finishing-your-3d-printed-105mm-artillery-shell-piggy-bank/
To create a Stencil for your shell check this out:
https://makersteve.com/2019/04/16/up-your-3d-printing-game-with-stencils-and-a-vinyl-cutter-go-cricut-go/
Not to be outdone by myself, created the split body version of the piggy bank so the smaller printers can make it.
I made one.. it when together well. Will require some touch-up paint. It's catching money now!
Please consider using these affiliate links for the Filament.
1.75mm Olive Drab PLA
Paramount 3D PLA (PANTONE Military Green 7764C) 1.75mm 1kg Filament [OGRL60037764C]
1.75mm Olive Drab ABS
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1.75mm Olive Drab FlexPLA
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Enjoy