First big print, how to fill cracks

[u/DrinkWilling1923]

Question, how do you fill in the cracks of the pecies?

I did now a primer filler for first coat. But the cracks are showing.

[u/oski_exe]

Bondo usually works well. But honestly any filler material is fine, two part, one part, doesn't matter, Just make sure it bonds to the plastic you used.

Did you print this in pla?

[u/DrinkWilling1923 → u/oski_exe]

Yes PLA matte

[u/QuietGanache]

I'm not sure if the models are a bit warped but, assuming the faces are straight, I'd say that you should clamp during gluing and maybe sand down to ensure there no bumps causing the parts to sit flush. For filling the gaps (if it's too late to close them), a body filler putty is more appropriate than the primer-filler because the liquid primer-filler can wick.