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lumeria

Hot End broke above the alublock

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My hot is broken. It was leaking filament on top of the aluminium block. In preventing filament melting over the temp and heater elements I removed the hot end. Trying to fasten the piece on top of the alu-block, it broke off...

Just did 1 print on a brand new machine and already in need of a new hot end... :oops:

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you mean that lovely copper pipe went.... POP and snapped in the middle, leaving the half the copper in the alumium hot block and the other half in your hand... I KNOW THAT FEELING !

they are damn delicate things those copper pieces. I snapped one trying to tighten it after some leaking and POP.... now i got a new one, added it and it still leaked a little (without me adding more pressure) I waited a few prints and then the leaking closed up on itself.... now working perfectly :-)

 

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I had the same problem at the very beginning. Did something wrong when mounting the brass pipe upside down with the result of jamming, leakage --> removing, cleaning, mounting again, and finally breaking both the pipe and the nozzle.

I ordered a replacement, but the pipe was out of stock. Then I went to our workshop and got a replacement within half an hour: pipe and nozzle in one piece, and all my problems are gone.

I guess it is a little design weakness to have two brass parts mounted against each other into an alu-block having a different thermal expansion coefficient: at 200°C they are no longer tight, tightening them at this temperature and removing when cold let them break easily. I have to admit that I haven't read the manual carefully i first place; it is written there to dismount the hot end at high temperature. But my solution seems to be much better.

Peter

 

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