This object performs exactly the same function as the original one. It has been modified in order to:
- The hole (pocket) on the extremes is bigger (1 mm), so that you do not have to sweet to put the bearings in place.
- The wall is thicker, so to have more robustness (I manage to break one of my original PLA ones... do not ask!!).
- A thicker wall also makes a difference if you are going to print it in ABS (the black one in the photo is made in ABS), because most of the seam gets inside the infill (that black line that you see), and the remaining does not affect the function at all (it rolls good!!).
If I would have to make a new one, I would use this design, though it consumes more filament. The gcode fie for ABS 230/90 is also included.