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After seeing MakerBlock's blog post yesterday I was inspired. So I went down to Walmart and bought 2500 4.5mm BBs (for $4) and set to work printing my own ball bearings.

I first tried printing the inner part in two pieces, but they proved hard to glue together. So I tried printing the inner part as one piece. I didn't think I'd be able to get enough BBs into the channel for it to work. I found that with pliers I can just muscle the last two or three BBs into the channel. The plastic deforms a bit, but it returns to normal immediately.

With this design, it makes me wonder if some parts that are designed to fit a 608 bearing could just have the outer bearing feature included. The you just print the inner part, add the BBs and grease and go!


Download Printable 608 Ball Bearing 3D Model Files

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