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Originally Posted by AdamHeard
Oh, you mean the beam couplers. Sorry.
You can make a straight coupler, but it'd be a lot of work to get a helical beam coupler made in shop.
There are knock off brand ones on ebay and amazon for cheaper. A lot of diy CNC suppliers stock them as well.
They're not real commonly used in FRC, the size and weight are somewhat prohibitive.
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You can get $6 beam couplers with asymmetric shaft sizes from China, you just have to wait about 3 - 4 weeks
They felt to have about the same strength and deformation-resistance as the $40 ones I had used before, but that doesn't really say much.