I was printing a simple cylinder shape, when I came back to check on it 2 hours later, there was a glob on the floor with the silicon nozzle casing IN it. There is also a massive glob on and around the nozzle.
1# how do I clean this up?
2# what can I do so this doesn’t happen again?
Additional info: I have printed this exact cylinder a few days ago with no problem. The only difference is that the first time I used Creality Print 4.3.1 as the slicer, this time I used the new 5.1.
Hello
I had the exact same problem a few weeks ago. I left a print running overnight (a 7 hour print). I’d printed the same print the day before with no problems but when I woke up the follwing day, the overnight print was just a big glob of hardened PLA with the silicon boot inside it!
I removed the print head and very carefully removed as much of the hardened PLA as I could with a pair of long nosed pliers. That removed most of the PLA from the outside of the nozzle but the inside was still clogged up. I used a hot air gun just enough to melt the PLA and then used the tool that came with the printer to push out the moulten PLA. I then gave it a good clean with some fine (P200) sandpaper. The hardest part for me was having to wait over a week for a replacement silicon boot!
Whether or not that’s the correct way to do it I have no idea, but it worked for me and the printer is running again with no issues. I’ve no idea what caused it to happen.
Hope this helps
Cheers
I will try this! Thank you so much
A heatgun and pliers you should be able get that lot off. Careful of the heater and thermistor wires, easy to break those. Was it a new nozzle that wasn’t tightened correctly? While stripping everything down check the PTFE tube, it can degrade and might need replacing.
Oops! Sorry, I forgot to mention that! Yes, the wires are very thin
Spare boots, I think I saw a packet of 5 on Amazon, pukka Creality parts. The thermistor is a slightly odd one with a ferrule on the end rather than a glass bead, can get these on Amazon and Aliexpress, keep a couple of spares same with the heater. Alternatively replace the whole hotend with the Microswiss Flowtech hotend should be impossible to get blob of death with one of those.
Yes, I bought mine on Amazon. A choice of a 3-pack or a 5-pack but the 5-pack was sold out 
The price difference was only a around £2/$2.60 I think.
Anyway, it seems to have worked and hasn’t happened again
It was possibly the first thing I thought. Because the nozzle was already assembled, I didn’t check it so that’s another one to add to the learning curve! 
Loose nozzles, I had that with loom I bought for my Ender 5 plus, it was so loose that it dropped out during assembly, official Creality loom too. So yes I learnt that lesson too.
