If you make them too long then you will have more friction! Also I don't recommend oiling them. You may end up with layer separation if the oil becomes absorbed. Also if you use oil it will attract dust and particles. Will end up possibly acting like more of an abrasive. If you buy the IGUS type they are impregnated with lubricant. I am gonna try this print and I will repost my results....if I remember. Lol.