J-Head MkV-B Plastic Parts

Well, I finally finished building my Prusa i3. I was attempting to do a few "air prints" with the machine to work out a few kinks with Pronterface on my host machine. To make a long story short, my thermistor came unattached and the nozzle of my J-head Mk V-B hotend melted apart. I have attached a photograph of the aftermath of the incident.

My question is: Is this salvageable? If so, how? If not, is there anywhere I could get just the plastic pieces since the actual nozzle doesn't appear to be damaged?

Thanks, any help is immensely appreciated!

it can be salvaged if the hole dia left behind in the peek is less than the diameter of the brass block. ( been there done that .

What you need to do is first clean the brass block of all the remaining plastic.. Then remove everything from the block. Next heat the block on a stove/propane torch/ hot air gun to above 150-200 degrees.. Then carefully screw the block in the peek and move it around till you have it perfectly lined up ( use your eyes to judge it ) ..

i had a similar situation and fixed my j-head .. it is running for over 6 months now. This will not work if the hole left behind is too big.

Welcome to the J-Head-meltdown-before-it-ever-printed-a-single-item club! Fool me once, shame on you. Fool me twice, shame on me. Just say no to PEEK! After the J-Head meltdown, I bought an all metal E3D and never looked back.....

Same thing happened to me (home z was too low and pressure grew to high). Thread was not fixable in my case so I drilled little hole in peek and tighten the block within the peek with small screw - similar to the way you tighten the belt pulleys.
Worked for me - I can send a picture once I get home.

Cheers, Larry.

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/Larry
(www.filamentshop.ie)

Thank you all for the replies! Ekaggrat, what would I need to do to clean the plastic off of the nozzle? PEEK doesn't seem to be susceptible to many solvents.

Vreihen, I will definitely be looking at the E3D for my next hot end. It looks a lot more sturdy than hat I have right now.

Filamentshop, I am interested to see how your method worked. Am I understanding correctly in that you installed a set screw to keep the nozzle in place?

Thanks!

Image attached - it has been leaking a bit, but it has always been leaking, didn't affect prits too much.
You could use ptfe-tape on the heating-block thread and on the screw to seal it a bit - I didn't bother since I've replaced it with e3d v6 soon after.
It did the job in the meantime.
As for cleaning - I used soldering iron, not too hot, just about to make plastic soft, but not liquid and pilers to remove it while still hot.
Good luck!

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/Larry
(www.filamentshop.ie)