HGL15 X&Y rail for BLV mod of Anet A8 / AM8 / Prusa

HGL15 rail system for BLV mgn12 3D printer mod.

I had many issues with Chinese made MGN12 linear guide ways, after some time they always get lose. Changing the guide-way block fixes the issue for some time :), but since they are not very durable and good quality (at least the cheap ones I've got from ebay) after a some printing hours the issue comes back. They are also not as stiff as I would like them to be.

So I decided to change the rail to a much better quality ones from HIWIN. Since t