I remember when CD writers were like this, about 25%-33% you tried to burn were coasters because your machine couldn't keep the write buffer full, so you had this delicate balancing act of setting it to burn and OH GOD DON'T TOUCH ANYTHING and hope for the best. They still blew my mind with how handy they were, and now CD/DVD burners are so dirt cheap and reliable that it's hard to imagine the days when they were so sensitive. I figure in a few years, 3D printers will get similarly more reliable and mainstream, and continue to fall in price, until people are churning out all sorts of widgets without giving it much thought or worry.