Drag Firebird in WIP: Drag Racing Models Posted April 27 Some of the 3D parts have better quality than others I have found. However they are better than the resin parts I have bought. It might be the same thing, where the supplier makes all the difference, but I have not been impressed with resin parts. Im trying to improve on my fabrication skills. Its cheaper than resin and 3d parts, but it takes awhile to get good enough to make a good part.