first off, you need to know if these facets are inverted. it happens quite often, they may face towards the inside of the model, sort of like if you would cut out a piece of your skin and flipped it and stitched it back inside out.
GMModelFix in my tools should allow you to examine the model closely. With culling ON these would disappear.
After eliminating any model issues, like inverted facets. generate proper lighting normals in the tool. use a smooth method to prevent drastic color changes.
Also your model should be large enough to limit z buffer confusion . Where (pixel of) elements are sorted and excluded during the draw process. if too small, the drawing may get into a state where it cannot determine what should be behind what. The effect is compounded if the color difference is drastic, like for inverted facets with lighting, the facet would be black (if culling is OFF the facet shows but the lighting is black 'cause the light is behind the facet) and so you see black and color fuzz at that spot.
The other part is the near far value of projection_ext can be tweaked to reduce the effect. and in GM8.1 there is an option to limit this as well but I forgot what it is.
In fact I had to adjust the faces of the drawing so black.
The design is definitely small.
Are not yet practical 3d and d3d, so I drew little for fear of overloading Game Maker.
I still have to learn to get the textures in d3d, I tried but I can not get good result.
Learn how to draw 3d was easy, but hard to put texture.
I downloaded Gmmodelfix.
Thanks again for your attention.
I will not bother you, but if you want to teach you something about the texture and where to find them?