Description
This design uses 32 additional metal pins (fi 2mm, length 8mm) on which steel balls are placed. Number of steel ball per layer was also doubled (4 per layer) to create full working plane.
License

This design uses 32 additional metal pins (fi 2mm, length 8mm) on which steel balls are placed. Number of steel ball per layer was also doubled (4 per layer) to create full working plane.