your best bet is probably abs and use acetone smoothing.

polymaker also make a pla type filament that can be smoothd. But it's a more expensive solvent.

If the 3d45 isn't fully enclosed - it would be pretty simple to make it so and that's best for abs..
I know it's a replicator clone - just can't remember if it's fully enclosed and can't be bothered to go look :-)

Have a look at abs-x as well. Like abs but easier to print with and apparently no warping, so you don't have to design with shrinkage calculated.