Welcome to the SeeMeCNC Community

I am on my 2ND rebuild of my hot-end. The first melted down because the board got shorted and turned the head on full for who knows how long. Then the second happen last night after working on getting the h1 printing for the first time. I was just getting good extrusion speed set and then the head just melted off.

[img]http://i1151.photobucket.com/albums/o634/thewiredmechanic/th_IMG_0088.jpg[/img]So after some research I found this little head. http://blog.reprap.org/2012/07/water-co ... t-end.html

Well it was off to cad and some drawings. I was able to make a mock up out of foam.

[img]http://i1151.photobucket.com/albums/o634/thewiredmechanic/th_IMG_0091.jpg[/img]

And then I was able to cast the head.[img]http://i1151.photobucket.com/albums/o634/thewiredmechanic/th_IMG_0095.jpg[/img]

All I have left to do is clean it up, drill and tap the holes.[img]http://i1151.photobucket.com/albums/o634/thewiredmechanic/th_IMG_0102.jpg[/img]
I also liked the idea of using a through hole thermistor. The thermistor will be installed just like the resistors. This should prevent the head from getting out of control .

This is the part after a quick clean up.
[img]http://i1151.photobucket.com/albums/o634/thewiredmechanic/th_IMG_0106.jpg[/img]

Very nice! I'm looking forward to your reports on performance.

Stienman

I most definitely will keep you posted. After looking at other options of fans for cooling ext.. I liked the idea of liquid cooling. My brain was racking around this thing all day. I figured I will put 2 thermistors in the system. I will be able to monitor the temp above the choke and in the hot end. I am trying to figure out how I plan drill the holes. I do not have access to machining tools. I have a large drill press at work. I think it will not look pretty but it should prove if I need the PEEK or not. I have decided to install the brass nozzle instead of trying to drill a .50 mm hole by hand. I did some test drilling last night and the run out was ridiculous. I have just got my parts for building a spindle for the H1. http://makeyourbot.org/low-cost-spindle-2-0 I was planing to have the unit printing to make a holder for it. I think I will cast the mounting instead.

Last night I had the hole head together. I put water to it using a windshield washer pump. One of the drilling's was to close to the center hole. I had water leaking out the end of the nozzle. So much for using a hand drill I was able to put some heat to it. With the leak the nozzle end cooled 50 degrees in less then a second It will be interesting to see what the next one will do.

what metal is that? I tried melting a can with a torch and it didn't really melt / pool it just burned