You can use that to create perfect recesses for bolts and fasteners, as well. For example, you can download the file for a press fit bearing, convert to 'hole' in TinkerCad, and subtract if from a base to make a perfect press fit.
I encourage modification as well! Once you're 3d printing you can add decorative elements, or even combine parts! Another thing you can do is use the product file as a subtraction/hole. Kings like motor mounts, pillow blocks, chain tensioners, specialized brackets, pulleys- will all print well on an extrusion printer. You can use this technique for all sorts of parts and many on master will print just fine on a lower resolution/extrusion 3d printer like a makerbot. The one on the left is the part as ordered from master, the one in the right is my printed part. I've printed the sprocket on an objet connex 500.
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