Although they do not have a function except from keeping the ABS used at a minimum and help cooling the part after molding, I would model them.
As Rene mentioned the part ist roatational symmetric (1/4) it will help reduce the file size
I don't know if you have got it, but here's the (rather rough) BI mesh as well
As Rene mentioned the part ist roatational symmetric (1/4) it will help reduce the file size
I don't know if you have got it, but here's the (rather rough) BI mesh as well