Thermal transfer coefficient of hardened steel nozzles
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I've seen nozzles where brass or even copper is used for the bulk of the nozzle with just a thin layer or coating of hardened material. This should offer wear resistance but with a thinner layer of less conductive hardened material, there is better heat transfer. On the other hand brass nozzles are cheap and cheerful, maybe just change them weekly and carry on.
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…..............................On the other hand brass nozzles are cheap and cheerful, maybe just change them weekly and carry on.
Which is another major drawback of the Diamond IMO. I've got one with 0.9mm nozzle (for use with T glass) but it means making up a whole new assembly complete with heat sinks, thermistor, cartridge etc. I've got one built up but haven't got around to trying it yet 'cos it still involves a fairly major strip down and rebuild. A removable nozzle would make life soooo much easier.
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This is what's put me off mixing hotends so far is the fear of being unable to remove a blockage from a nozzle and having a large chunk of scrap brass in the waste metal bin shortly afterwards. Is there a way to have a cheap, easily replaceable mixing nozzle?
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This is what's put me off mixing hotends so far is the fear of being unable to remove a blockage from a nozzle and having a large chunk of scrap brass in the waste metal bin shortly afterwards. Is there a way to have a cheap, easily replaceable mixing nozzle?
No easily replaceable nozzle yet (or not one that I know of) - but I hold my hopes up. IMO the perfect mixing hot end has yet to be designed (but I'm working on it…...)
Having said that, the only time I've had issues with blockages has been caused by heat creep and a softening then hardening of the filament inside the heat sinks. Easily remedied by letting the hot end cool down properly before turning off the machine\fan (we live and learn). I am very careful with what goes into the hot end though, and I dare not try anything that might be abrasive in nature.
