ABS gunk on heater core

It's possible to get a little scrap of filemt on the heater block and have the resulting puddle mimic a leak.

Leak causes:

1)The nozzle isn't tight. Check, carefully, while hot.

2)The heat break tube and the nozzle are supposed to jam together in the heater block. If the tube isn't screwed far enough in, the nozzle can jam against the block instead and not seal properly.

3)The mating surfaces of the bozzle and heat break tube are not parallel, are warped, or have a chip, dent etc.

Disassembly is pretty easy - the press is nice this way. And it's handy to know how - odds favor that someday you'll need to clear a nozzle jam.

Not sure if there's official diections, but here's what I do: First heat and retract the filament. With the hot end warm, reach in with a box end wrench and loosen the nozzle a bit. (7mm, if I remember rightly). I use a small pair of slip joint pliers to hold the heater block so that I don't stress the heat break, although that mars the surface of the heater block. (A bit of woven stove gasket slipped over the pliers would preserve the cosmetics.)

Then let it cool and remove the nozzle rest of the way.  Unscrew the two knurled pins holding the extruder together, and the heat break tube will come of the extruder block. You should then be able to unscew the heat break tube from the heater block. Mind the wires to the heater block.

On reassembly, make sure the heat break tube is screwed in far enough that the nozzle will jam against it and not the heater block. Make sure you don't cross thread the nozzle - cold plastic may be partially blocking the threads. (Some thrilll seekers do this with the block warmed). You'll want to snug up the nozzle while warm, being careful not to snap the tube at the heat break. Pliers are handy here again to keep the heater block from turning.

I haven't done that. The heater block is probably acetone safe, but the heater & thermister are unlikely. I haven't looked to see how they are secured on the Press. Reassembled wrongly, either electrical part can cause a fire hazard, so be careful.