ABS rod works really well since it is less fragile at those small diameters  -- you can solvent weld it the exact same way but you need dichloromethane for the solvent .

Like this -- > https://www.scalehobbyist.com/catagories/Paint_and_Construction/plast-i-weld-plastic-welder/FLX00007112/product.php?s=4&t=2&u=0

But you can get it off Amazon from other manufacturers  , it will be labeled for solvent welding ABS .