my small experience in 3d printing in the last year is that most of problems are from :
- bad software, i bought simplify3d and solved most of my problems
- too much hurry, fdm need time, and right speed printing to obtain quality
- good abs filament is good print, too often i saw error and problem from bad filament, bad storage of filament that cause a lots of problem
- not enought time to setup printing bed, calibration can change a lot the result, few seconds against hours and hours of wrong print
- good heated bed give me good print. a 6mm glass with a good base of hair spray keep print on bed and print come out clean and good.
- before print load ever 40-50 of filament to clean up warm camera from old abs, you have good result and reduce problem later
- don't try to print all in one piece, often give you problem, like to do a single piece mold of prostetic makeup, is often a bad idea.
- try to build less support than you need, change orientation and position of piece on bed to reduce it
- avoid temperature change in the room, especially if is open printer. My printer was open, i boxed it and reduce a lots of problem.
- try to use only natural abs, is between milk color and beige, without pigment often give you fine and more quality than pigmented abs.
- abs vs pla, pla is simplier to print, but it cristalize and is delicate, if you warm too much it cristalize and seal your extruder, and clean it is long and boring, ABS need temperature stabile and have cons of size reduction since 1-2% depend of its infill, but is elastic, workable with sand paper and more. Too often people start with pla be cause many people told is simplier and that discourage them to print more. Abs is better on long time.
fdm is an old tech, since 80' than you cannot ask so complex result for few bucks, but you can obtain some good result.
i used a makerblot clone called migce cuble, and a wahnao 4x, last is good for its cost, and result could be very fine also to print 0.05 layer.
but remember low cost 3d print CANNOT BE FASTER, i talk about a simplier replica of Saffo's statue 10 cm ask since 5-6 hours of print.