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I've used Milliputt which is a two stick epoxy you cut a piece off each stick and mash them together in your fingers. It gets sticky and warm and you mould it however you want. Once set it feels like a piece of plastic and yes can be tooled to shape further. I have a tool that clips into a cover, the clip broke and I put a bit of milliputt on to reinforce the clip and 20yrs on the clip still works fine as it should, the milliput didnt crack or bend. Bunnings has a similar product these days, works the same way, think you find it with sealants.
The epoxy types are a more permanent solution, and if it fails that might be a problem. The heated plastic types may fail if they are in a load bearing use and stored where the summer heat might weaken them too. 3D printing has the advantage of being able to replace a part rather than repair so if a printed part fails you can just take it off whereas moulding to parts can be difficult to remove and start again (think removing chewing gum from under school desks).
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