I have some tri color filament but the result is not very mixed, and I want it to mix more to create a sort of gradient, how can I get it to mix more in the hottend
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Tricolour filaments are designed to produce different colours on three sides when printed, giving models different appearances when rotated.
It isn’t meant to blend or produce a gradient.
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I know, but the model is circular and I want it to slowly change, not just change all of a sudden. I figure if it spends longer in the hottend it will mix slightly more and get this effect.
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You could try a smaller layer height, if it is smooshed more it might mix some.
A lot depends on a filament itself, how it is wound on a spool, etc. I currently have a tricolor filament that prints unevenly - at the beggining it produced different colors on three sides but over time the effects began to change and the colors started “mixing” (and I was unhappy because I didn’t want that 
)
There are many tri-color filaments available. But they tend to come in 3 broad categories: Red-Green-Blue dark, shiny, and no shading; Magenta-Yellow-Blue bright, shiny, some shading and intermediate colors; and a harder to find Rose-Green-SkyBlue that isn’t as shiny, but shows LOTS of shading and intermediate colors.
Let me go get a photo of some samples, in the order mentioned:
From the sound of it, you have the first (left side) version that doesn’t show too many intermediate colors. Most people seem to use the middle version (bright, shiny, colorful, garish).
So I got 2 types from the same brand, OVV3D. One of them, the red green blue, prints with a lot of gradient and prints very well, but the red blue yellow one has almost no gradient and is like a wall. I am using the same model for both.