So, loving my new Mini (when I have time to actually use it). But I’ve noticed something odd – with only about 15hrs of actual print time on the machine, my hot end heater block has developed a coating of what looks like melted/burned caramel. And during the first part of a print (usually during the perimeter/skirt phase), I’m getting a few small popping noises – like someone popping really tiny bubble wrap, or very small bubbles in chewing gum.
Now, from what I’ve read, popping noises like that are normally due to water absorbed into the filament. But this is a brand-new spool of Lulz HIPS that just came out of an airtight package with a dessicant packet, plus it’s been in a low-humidity environment since opening. And the pops only occur at the beginning of a print, not during.
As to the “caramel” leakage, I haven’t found anything searching the forum archives, but I’ve heard of some people having issues with PEEK liners (I think?) melting and leaking out through the threads of the hot end. Could this be what I’m seeing? So far, I’ve only used this one spool of HIPS in this printer, and only used the default Cura profile settings for the Mini – I haven’t tried any exotic filaments or experimented with any temperature settings.