Have you taken a look recently at the stock chart of 3D Systems Corporation (NYSE:DDD)? The stock has been trading sideways in a range between $12-$18 since April 2016. So why should this be of great concern to investors who are long the stock? With the stock market at all-time highs, why can't 3D Systems Corp catch a bid and rally? Another concern aspect is that it continues to hangout in the lower portion of the range from $12-$14. This should excite shorts because it increases the chances of a break lower. Overall, the price action is just not healthy.