M8 to Nema-17 Z-Coupler
by jameswood, published
If you need a rigid coupler these are great, but for most reprap applications (including the Printrbot Plus), give mine a miss. Sorry!
A simple coupler to mount M8 threaded rods to a NEMA 17 stepper. The up arrow points up!
I'm [no longer] using two of these on my Printrbot Plus and so far, [have changed my mind about them being] so good. (Don't overtighten!)
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Perhaps the piece is so rigid as the walls are so thick (they look to be something like 8 mm thick, right?). Reducing the width of these to something closer to 2 or 3 mm should allow the frame to be a bit more flexible whilst still being strong enough to use.
The fit is so snug that it isn't a problem. The motor side needs tapping with a screwdriver to get it on there, and the threaded rod needs screwing into the connector. The plate is really thin and can be cut out, but I don't think you'll need to.
If anything, I think these might be slightly *too* rigid. I'm getting some z-banding that I wasn't before, but I have also recently made many other upgrades and I'm still trying to nail down the exact cause.
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