Ultimate belt Fixing block Lerdge Smaller Version (non linear rails user)

trying to make Lerdge iX  fixing belt unbreakable

Recommendations 

 Print in PETG uses more than 5 layer perimeters

I used 

a) 2 M3 12mm

b) 2 M3 10mm

c) 2 M3 6mm coupling nut (must have) 

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