5/16th to 5mm Coupler

thingiverse

I was unable to find an odd coupler size that fit so I decided to create and share this custom drive coupler for my linear rail design, which I'll be uploading soon, enjoy! UPDATE 2-20-16: After finding it not quite gripping all the way, I made adjustments by shrinking both the holes by .5mm. I also added .5mm to the cut out section between the fasteners to give it a bit more room to tighten down.