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MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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The truth is that I am located in the US where metric hardware is hard to find and expensive. So, even though I design everything in mm, I have no idea what the "common" metric fastener sizes are.

I have updated the description to be explicit about what fasteners I am using and their total weight.

The important thing is to hit the target weight, not how you get there. Nuts and bolts are commonly available and easy to attach. But, anything dense should work.

Thanks for the compliment. I worked hard on this and am happy with it so far. I certainly would not have come up with this idea without learning from and leveraging the work of others.

I feel pretty comfortable about gravity lasting longer than any print I might undertake. : )

My long term concern is breaking teeth off the small gear or track (which is why I printed them in more durable PETG rather than more rigid, but brittle PLA).