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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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As others have said, there are tons of fillers (Bondo, Rage Gold, glazing putties, etc) that you can use for this. If your part is flexible make sure you use something that can flex, otherwise it will crack.
That said, consider the cost of doing this in terms of both time and material $$ first and then weigh that against simply printing the part again. If you've never worked with fillers before you'll have to do the apply, wait for it to dry, sand, apply more loop a few times. It's not necessary a bad skill set to learn, but it will take some time/effort and the materials aren't free.