1 Topic by op7ical

  • op7ical
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Topic: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

I am having some difficulty coming up with a way to create a good ducted fan to use in conjunction with my J-Head nozzle and Lawsy's MK IV mount.  Has anyone else figured a good design for this?

The main issue is that there is not quite enough clearance under the X-Carriage to fit a good duct all the way around (at least I couldn't).  I tried using a circular duct from Thingiverse (see picture) that I chopped to allow it to fit right up to the x-carriage.  I made a separate bracket to mount it.  Unfortunately, the air flow was too weak in the back, so the back side did not cool properly. 

To test the performance of cooling, I printed a single 6x6x40mm vertical block.  If cooling is working well, it should not smear or warp during the print (or at least be a lot better when cooling is turned on).

http://www.soliforum.com/misc.php?action=pun_attachment&item=1842&download=0&secure_str=712f4

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2 Reply by DePartedPrinter

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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

Can you show a picture of how this mounts?

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/

3 Reply by op7ical

  • op7ical
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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

Can you show a picture of how this mounts?

Here are some images of the mount and the whole thing when it is attached.

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4 Reply by DePartedPrinter

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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

What does the underside look like? Is it just blowing air from that one side or from both the left and right?

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/

5 Reply by op7ical

  • op7ical
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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

The underside is a ring duct that normally goes all the way around.  I cut it off halfway, so the airflow only goes around the front and the left/right sides.  Ideally it should cover the back too, but I can't fit that much of the ring in this setup.

6 Reply by DePartedPrinter (edited by DePartedPrinter 2013-04-25 16:25:54)

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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

I would kill the ring duct because the airflow is probably 90% coming from the front still. I would try ducting the air to blow just from the left and right side of your J-head.

Also, how is the MK V working out on your printer?  I am thinking about ordering a Mk V-B.

SD2 with E3D, SD Press, Form 1+
Filastruder
NYLON (taulman): http://www.soliforum.com/topic/466/nylon/

7 Reply by op7ical

  • op7ical
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Re: Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

I would kill the ring duct because the airflow if probably 90% coming from the front still. I would try ducting the air to blow just from the left and right side of your J-head.

That is probably the best way to go. I should be able to get less air resistance that way as well.  I would say almost 80% of the airflow is reflected due to the very non-ideal configuration of that duct.

 

Also, how is the MK V working out on your printer?  I am thinking about ordering a Mk V-B.

It is quite good so far.  I have the BV version from hotends.com.  I like the thermistor placement since it allows for very accurate readings of the hot-end temperature compared to Solidoodle's solution.

I have had a few clogs with it so far, and they all seemed to happen around the same short period of time.  In each case I cleared it instantly and easily with a guitar string, so it was only a minor nuisance.  It may have been a problem with humidity, or some contamination residing near the nozzle.

I was able to get away with using solder joints directly for the resistor and thermistor connections (no crimping).  I am not sure I would recommend this to others since it could turn out badly, but I think the key is just to use mainly uninsulated wire for most of the length from the hotend so that it can radiate heat before it reaches the joint.  I electrically insulated each wire with a little kapton tape.  It has been holding strong for a few months now.