While it is not at all necessary, you can do several things with your finished 3D print to make it look that much better. You can sand it down, using low-grain sandpaper to get a smoother shape. However, you may lose some of the sharpness of the shapes in the print.You can polish the print to make it shine, or varnish it to make it shine.If you know the item will be in use while exposed to the elements, it may be worth treating with a layer of hydrophobic spray, or even a coat of UV resistant spray. You can also treat metal items with anti-rust products.There is also the possibility to hand paint the items if you so desire.Also, you can give the print an acetone vapour bath depending on the material to remove the grid-like effect on your print (see the previous question ''should I do an acetone bath'' for more on acetone baths.