Citadel Plug Modification

Hi everyone,
that's my modification to citadel paints. My problem is pouring colour on my palette. Vallejo miniature colours have already their special Plug.
I tried to design this tuning. I've never 3d printed, maybe i've made some mistakes.. Feel free to share and to mix. If you print it i appreciate a review, positive or negative, no problem. I just want to know eventually my mistakes.