With the new pricing models -- especially in Detail Plastic -- it is important to use sprues or links (like those in a chain) to keep multi-part models together and considered one "part". This also helps Shapeways' efficiency, since they can clean and bag the item in one operation rather than trying to fish a dozen parts out of the cleaning output. However, it is not well documented what the spruing and linking guidelines are in that material. Versatile Plastic spells it out on the materials page (well, at least for sprues). For Detail Plastic, do the sprues need to be 1mm in diameter, or 1.6 mm in diameter, or 2mm in diameter? Is the same true for links? Do sprues need to attach at one point to the real model or (where practical) two? Do the attachment points have to be widely separated? There is plenty of folklore on these topics, but I'd like to see these hints directly in the Material Guideline pages. Perhaps it was overlooked because it wasn't essential before the new pricing models premiered.