So I had a problem that when i print multiple prints sometimes they dont fit together perfectly, theres a bit of bleed. I found a neat trick where you can just wave the joint over a candle for a second or 2 and fit it together. The filament becomes slightly soft and when connected it hardens to fit a bit better. That bottle cap just wouldnt screw in but now it does.
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Hot water can also be useful in some case (not boiling hot), also help to avoid burned marked due to a flame (in particular with white filament)