MGN-12H Carriage Loader

This retainer saves time and eliminates frustration when mounting [Hiwin MGN-12C](https://www.amazon.com/gp/product/B0762MKQFD/ref=as_li_tl?ie=UTF8&tag=mgx3d-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B0762MKQFD&linkId=8ac118644eab6c72120338db20fb3236)/MGN-12H carriages back onto the linear rails. These 12mm linear rails are typically used in Kossel based printers and although the carriages have a wire retainer it does not do a good job in preventing the balls from escaping.

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