One of the most important things to keep in mind for 3d printing is the thickness values of each part based on the type of printing that will be used. A good rule of thumb is that most 3d printers have a minimum thickness tolerance between 0.8-2mm. I usually like to make parts at a 2mm thickness just to be sure it works under the widest range of printers, but sometimes that is not going to be possible if the object is very small scale. So stay within the 0.8mm thickness for everything at the very least.