Joris makes lots of cups that are watertight - he is the expert so consider talking to him. I think he lives in Eindhoven or somewhere near Amsterdam. Anyway he prefers to use a larger nozzle I believe. A .6 or .8mm nozzle. His cups are quite light weight. But if he uses a smaller nozzle than .6 I think he over extrudes (sets shell to maybe .8mm or .6mm with a .4mm nozzle). This fills in all the cracks and makes it water tight.
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gr5 2,224
Turn on the "spiralize" feature. This will make it do the double thickness that you want. Without that checked then it will do 2 passes with the .4mm nozzle but spiralize is designed to make water tight cups or vases. Also print slow - this is heavy over extrusion (.8mm trace out of a .4mm nozzle). Also .05 is a bit thin - the upper layers might not be able to nicely melt the layer below with such a thin coat. I recommend .1mm at least to see if that helps with water tight.
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JohnFox 25
I think you need to be quite a lot thicker to be fully waterproof. Double thickness is marginal.
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