@jmgerard hi, from your description, you can try the follow methods: First check whether the printing temperature is normal (PLA: 200±5℃; ABS: 250±5℃), whether your filaments are damp or damaged. Check whether the fan of the nozzle runs normally. If the fan does not run, the heat dissipation may not be timely, resulting in clogging. Check whether the extrusion clip is broken and whether the extrusion motor rotates normally. If it does not rotate, it shall be dealt with as the motor problem. Please refer to this video: https://youtu.be/gRNODW_Hx5I If the first layer printing plugs, consider whether the nozzle is too close to the nozzle. You can try leveling it again, you can refer to this video from 2: 50 https://www.youtube.com/watch?v=OS9Ra3RWmUc