@jegor-m there doesn’t seem to be the need, but @riceandcarry are really the moulding experts! The mould does get pretty warm though.
By splitting the mould across the pipe thread it means you can easily clean out the material at the mould entrance. We call those the ‘spinning tops’
Hi @jegor-m
yeah, exactly. I wrote a little blog about it here: http://colombodesignstudio.com/insert-mould-zero-waste-recycling/
The limitation then becomes the size of the insert, obviously.
In this case we based it on a few factors, such as the size of a key ring and also a fin key I’ve got in mind, but also the size that my cnc can handle.
Lee
This is a great design, mate. Do you preheat the mould before plastic injection?
hi @leebaz,
Am I right to assume that the rectangular part of the mould (with rounded corners) is an insert you can replace with some other insert for a different product?
Hi all, we’ve learned quite a bit through making the moulds for @riceandcarry – happy to help out with any questions you might have if you’re finding it frustrating. Happy to design and make moulds for you too of course 
Thank @becka, did you post your attempt somewhere?
Great idea. I love the impression – very clear and legible. I wish mine came out so well…