3D Systems spikes down through its 10-day moving average, levels to watch The stock is down over 12.3% at time of writing, last at $60.54. This is off the low of the day which saw the $60 level break, $59.23, which is now support. The shares fell after a competitor in the 3-D printing space. ExOne, said it would file for an IPO. Stratasys (SSYS) is also tumbling, down over 9.9%. Resistance for 3D Systems (DDD) is at $61.29.