fiberglass?
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You need some kind of filler if you want seams to disappear, like bondo. The filler will be ugly though so you're going to need paint for sure.
Clever design can make seams less visible but the joints are always going to be there to some degree.
Or just live with the seams lol.
Fixing your warping/shrinking will make them less visible too.
Buy a 3d printer pen. Believe it or not they are pretty great at filling the spaces as long as the spaces are not too complicated or wide.
I came here to say this. Mine was, I think, name brand and it was only $35 and I've already used it to fix a few broken and flawed prints. Heat the filament up a little extra and you can squish it in place with the proper implememt without much if any trouble.
I used a mixture of baking soda+super glue which you can apply using a small spatula. This would require sanding afterwards of course and ideally painting, but it worked for me.
Print using a scarf joint so the seams have an overlap. Also that would get them up off the build plate where your warping problem is.
White silicone caulk would probably work well. Silicone wont get flaky or degrade over time.
Can you remove material from the left side of the joint? That would close the gap on the right.
Sugru would be pretty good at filling the gap