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Nice vid! You can print one of these for just 30 GBP? You know high end locks go for a lot more than that right? You could be printing money!

Yep the nice Abloy ones go for over three hundred livres Anglais.

But nobody is going to buy a single thing that the insurers haven't approved.

Maybe partner with a firm that will get insurance approval then? Could help with distribution as well.

I don't think those high end locks are made of plastic though!

There are 3d printers which print metal right?

Upvoted you, because I think your design uses a very similar idea as the one posted by OP, but its design is more simple /elegant.

Very nice print job, wow.