Wood is good!!... Acrylic can be a rather difficult, I always run a rats tail file through my blanks, then a small flue brush and finish with a couple of twists of a snail countersink.... Sounds a lot but takes moments and can help stop mistakes...
BTW if your checking your pens finish or marks/scratches take a quick picture on your mobile phone... You can zoom in and check the flaws.... Really handy
Just remember to delete the picture so you don't post it on a forum by mistake