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Why not simply buy one? What level of design are you looking for - sub-millimetre drawings of all the parts, including the complex splined-gear which grips the filament? Details of what wire thickness is used to make the spring? (too weak won't feed, too strong will damage the filament). If so you won't find anyone giving you that - there's a lot of work even in these small items! Why should anyone simply dish that out for free?

 

You might find ideas in thingiverse, but if you want the design, it's up to you to reverse-engineer it, if that's what you want.

Or simply design your own, why not? People here can help you with design questions & ideas, if you ask precisely.

I'm perfectly capable of designing any small spring like that one, but would need to know the outside dimensions & what forces you want at what spring-length. I also cut gears. What tooth-shape did you want? How much are you prepared to pay, if you want someone else to design (a clone of) this  for you?

 

Simply asking "I want a design" is much too vague.

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