Hi I use wood filler because it doesn’t have that strong chemical smell and I can water it down .
So I print all my parts and attach them together by melting them together with an old soldering iron. I sand every part with 60 grit sandpaper next I fill in all the groves with wood filler where I melted the parts together. Next I take some wood filler and mix it with water until its a thick paint consistency and paint the entire thing with it let it dry and paint it again. make sure any fine details are not covered up when its dry sand it with 220 grit sandpaper until the whole thing is smooth. clean all the dust off I use a clean rag and isopropyl alcohol make sure its dry and spray with primmer . Let it dry and sand it with 400 grit sandpaper repeat priming and sanding until its perfect . Clean it and now you can paint it whatever color you want to finish.
hope this makes sense.