Try the following tip to unblock your 3Doodler Create. Make sure your pen is turned on and fully heated up. Once it is, carefully remove the nozzle with the mini wrench. After it has been removed, insert the cleaning rod in through the pen tip while the reverse function is engaged. This should push the strand out of the back of the pen, thus clearing any clogs. If you still need assistance, please contact our customer service team at email@example.com and we will be more than happy to assist you.