SoliForum - 3D Printing Community — Suggestions for fan mount with J-Head MK V and Lawsy's MK IV?

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

null@example.com (op7ical) — Thu, 25 Apr 2013 16:04:06 +0000

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.

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

null@example.com (DePartedPrinter) — Thu, 25 Apr 2013 15:49:12 +0000

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.

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

null@example.com (op7ical) — Thu, 25 Apr 2013 05:23:57 +0000

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.

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

null@example.com (DePartedPrinter) — Thu, 25 Apr 2013 04:11:26 +0000

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

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

null@example.com (op7ical) — Thu, 25 Apr 2013 02:44:02 +0000

Can you show a picture of how this mounts?

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

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

null@example.com (DePartedPrinter) — Thu, 25 Apr 2013 00:52:12 +0000

Can you show a picture of how this mounts?

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

null@example.com (op7ical) — Wed, 24 Apr 2013 03:27:18 +0000

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).