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Con-Helical Flexible Coupler

by LoboCNC Dec 23, 2016
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Printed some of these (the variant with nut traps) in PETG. They came out good, with just the right amount of flex, and they're nice and stiff lengthwise.

While they fit on my bot just fine, you should consider removing one or two turns from the helix, and deepening the bores, to make the couplers shorter overall, and to not sit quite so high up above the motors, otherwise they may not fit into printers with short hotends, or where the hotend is mounted fairly high on the X carriage (both of which put the X gantry lower relative to the nozzle, possibly to the point where the X ends will collide with the couplers).

With PETG, I probably could remove a turn or two and still have it flexible enough. With PLA, I'd worry about cracking if it were too short.

That's what I was thinking also.

Thanks for the idea! I took the idea and created my own for my rc jet boat. Its is working well so far. I printed it in PLA.

I eliminated the center core, so mine has a small bore all the way through, and it seems to be fine. awesome idea!!

Would it be a bad idea to print this in PLA?

I printed mine in PLA. ABS, PETG or nylon would be good choices as well.

This is NO flexible coupling ! Geee ! And poor flexible couplers are a major cause of wobbling !
All what can be wrong in a coupler has been incorporated in this "design" :)

Can you explain why?
I personally have a problem with my stock flexible couplers where my sleeves offer a little bit of resistance and the z axis doesn't move at every layer but rather one out of two on some of the heights of the print. This design seems like it would remove the z flex while allowing for a little bit of angle flex.