This is redesigned Resin Tank for Sparkmaker with Gasket.
Gasket is made out of silicone baking mat. Or you can 3d print it with flex material.
I also added gasket cutting tool template so you can easily cut out the shape of the gasket from baking mat.
Printed with ColorFabb nGen material with 2,4 mm wall thickness and 2 mm top and bottom layers.
I also used Ironing mode to smooth the contact surfaces.
Light sanding with smooth sandpaper
Insert brass thread inserts in the tank body
Create Gasket for the tank
Buy MÖNSTRAD Baking Mat from IKEA, and use the 3d printed template to cut it out using a scalpel. Be careful though not to cut yourself!
PS 3d print your cutting tool template before you'll cut out the gasket shape (on image white part).
Make holes in gasket for screws
When you assemble all together, before you start inserting the screws, use sharp tool to punch the holes in fep film and the gasket.
Finally, when you put all together use pillars if necessary to stretch the fep film even more, before you tighten all the screws.
You will need 20 M3 x 10 mm Allen Screws with Flat head