It looks like it is over-extruding a lot.

Your printer seems to be a replicator-dual clone and should print very well (my three clones print excellently).

What settings did you use in S3D? If you select 'flashforge dual' as the basic printer type and work from there it should give good results. Also, measure your filament with a digital caliper. Some filaments are way off. Playing with the filament diameter can help when slicing.