rob, you can smooth it but not with acetone. you use methylene chloride. abs can tend to separate from the internal stress it develops during the printing process. since the pet+ has a super low thermal expansion rate it doesnt layer crack or warp. actually it can warp a little. its about the same as pla. its a very strong plastic. in many ways it reminds me of nylon. flexibility is about the same as taulman 618.