FUBAR: after 4 months of heavy use, my Snapmaker encountered its first trauma… when I was not looking for an hour, the print went awry and plastic melted back inside the print head and just kept going… wow this is going to need a bit of surgery to excise this lot… if possible.
I am actually OK with this… another piece of learning. After reading forums and articles I think that my run of success has been exceptional.
hmmm more lasering or start learning to use the CNC.
(@Daniel , suggestion for future design… food for thought to your engineers to stop back-flow and ingress of heated plastic into the print head. )