SoliForum - 3D Printing Community — J-Head length

Re: J-Head length

2013-12-11T00:02:21Z

Just a quick note, got it, install was easy (everything included, and then some). Maybe a couple of hours to build (including soldering and hand-crimping Y-splitter wires for the 12V supply plus some stupid things I did with crimping JST connectors -- without the latter, it would have been under an hour). I used some silver thermal compound for thermistor (tiny bit, to avoid shorts) and heater.

First impressions (ABS so far): excellent! Heats up to 225C in about a minute, holds temperature great (just a tiny ~2C overshoot when it first reaches setpoint, then perfect flat line!), doesn't flinch when cooling fan comes on (unlike a 10-15C drop I was observing with the stock hotend), doesn't need much retraction, and whenever I change filament I'm still amazed how smooth it is (retracted filament comes out in one nice-looking piece, and it takes maybe 50mm [sic] to flush out the old color, unlike 200-500mm with the old hotend!). And all this with stock electronics and PSU (although I have a beefier PSU on order).

Now if I could say the same about the rest of the printer (took this as excuse to rip out extruder and carriages as well... too many things changed at once, I never learn... so excuse me while I go rip out some hair too... ). As for the shroud, I just redid it in OpenSCAD (fairly simple structure) but now distracted with other things, lawsy's under-carriage fan is just fine (since I changed carriages).

Re: J-Head length

2013-11-22T01:18:40Z

If you email Sanjay, you might be able to get another format.

Re: J-Head length

2013-11-22T00:45:47Z

elmoret wrote:

http://www.thingiverse.com/thing:114036

Yes, seen that, but has only STL -- in long run, probably easier to redo it based on mechanical drawings on e3d-online.com than fiddle with STL. Thx anyway.

Re: J-Head length

2013-11-21T23:07:02Z

http://www.thingiverse.com/thing:114036

Re: J-Head length

2013-11-21T21:39:44Z

Thanks!!! ..and, really looking forward to see what I got myself into this time.

BTW, is CAD source for the fan shroud available anywhere btw? I'd like to try a tweak or two (for a nozzle cooling fan on the side)..

Re: J-Head length

2013-11-21T15:04:30Z

free shipping with "FreeShipE3D", too.

Re: J-Head length

2013-11-21T14:53:01Z

Wait... The E3D is basically same price as J-head?? Hmmm...

Re: J-Head length

2013-11-21T05:28:33Z

If you're referring to E3D, sure. I wasn't (sorry for confusion), and if I need extra travel (ie jhead is shorter than MG hotend), I'll need a longer leadscrew instead.

Re: J-Head length

2013-11-21T01:39:38Z

All you need is a longer screw on the z-stop.

Re: J-Head length

2013-11-21T01:08:37Z

Yep, but with my current anti-backlash "bandaid", I have almost no extra travel left (and I realize it'll be a Saturday morning to "fix", but trying to avoid that for now). I've been eyeing E3D as well, that'll probably be my second hotend (maybe Xmas).

Re: J-Head length

2013-11-20T21:28:02Z

Existing z-axis adjustment is plenty for the j-head. If you're upgrading, check out the E3D - well regarded on these forums.

Fully disclosure - I distribute them for E3D... but I am not alone in my affinity for the design.

J-Head length

2013-11-20T21:25:31Z

Anyone know the J-Head Mk-V groove to nozzle tip distance?

Tried Google and forum search, but failed to find anything -- basically, before getting one, want to figure out if I'll have to mess with z-axis or not (thought I read somewhere that you *gain* travel, which would probably mean my current rod is too short).

TIA!