If there are multiple blockages during printing, please cancel the print task and refer to the following steps to troubleshoot the problem.
When removing the hot end of the print head and reinstalling it, you must check whether the print head is in place. (If it is not installed in place, the hot end nozzle may scrape the hot bed)
S2.0 Allen Key
Pliers
Nozzle cleaner
1. Check whether the buffer mechanism is smooth, and pull the 4 buffers to observe whether they rebound normally.