In article ,
wrote:
The original was simply a lump of plastic. Injection moulding, I'd
guess. If a 3D printer can't make the same and as strong, not much
point other than as a toy.

Some can. You used the wrong plastic, as well as copying a flawed design.

I didn't make them. They were made commercially. By a specialist in such
things. Given what they cost, should have been the strongest plastic on
the market.

The design is indeed flawed. But if it gave a few years use in practice
before breaking but much shorter with the printed one it's fair to say it
wasn't as well made.

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*Why is it considered necessary to screw down the lid of a coffin?

Dave Plowman London SW
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