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PibunJeh

UM2 Hot End Pack part

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Before you re-attach the fan shroud put it in the hole that the nozzle will stick through - from above.  Once the nozzle is sticking through the hole it should be held in by the nozzle block.

It's never happened to me but sometimes a part comes loose during a print and although usually it's knocked over, sometimes it is stuck to the nozzle and carried around on the bed.  If in addition to these 2 bad things happening you ignore the print for an hour, you will get a massive glob of liquid filament and some of that can get up through into the head and clog everything up.  This tiny ring prevents this.  But again - 3 things have to go wrong for this to happen so it's a bit rare.

Edited by Guest

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