3D Printer Linear Rail Comparison - Hiwin vs Robotdigg: Part 1

Want to build a 3D printer using linear rail but unsure if the Hiwin rails and carriages are worth spending all the extra money on? We're going to find out what we can by comparing the Hiwin rails to a named mid-range competitor - Robotdigg. After all, what's the point in comparison with something nameless that we can't track down again and repeat tests and builds with?

Part one of this comparison is not quite an unboxing but should give you some first impressions about what to expect from each. In the next video, I plan to make a test to see what deflection each set gives under a repeatable moment. If either give me cause for concern, I can relegate that brand to the Z axis rails and buy more for X or Y. After that, I'm going to slowly build a 3D printer with them. I'd like to do a build log but I don't want to set expectations too high about the build pace (pretty much designing as I go) or quality of video documentation.

Here's the link for the Robotdigg rails (bear in mind that the listing is for the shorter carriage - you have to ask for the longer one): http://www.robotdigg.com/product/779/...

Here's the place I got the Hiwin rail from: (update 9/10/17: the link is dead now. The seller is linkcnc Store on Aliexpress but they don't seem to be selling the MGN range anymore, only the HGR range, of which 15mm is the smallest I can see) http://m.aliexpress.com/search.htm?se...