Help printing e3D fan duct Hello. I am trying to print the fan duct that is compatible with e3D hotend. At some point the part becomes very thin, and the plastic just wont have enough time to cool before the new layer comes. [attachment 68417 e3d_fan_duct.jpg] Do you have any suggestions that might help me print this? Thanks. https://reprap.org/forum/read.php?292,601693,601693#msg-601693 Mon, 11 May 2026 20:37:26 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?292,601693,602810#msg-602810 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602810#msg-602810 nophead Mendel90 Thu, 31 Dec 2015 07:23:47 -0500 https://reprap.org/forum/read.php?292,601693,602809#msg-602809 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602809#msg-602809 nophead Mendel90 Thu, 31 Dec 2015 07:22:21 -0500 https://reprap.org/forum/read.php?292,601693,602775#msg-602775 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602775#msg-602775 neildarlow Mendel90 Thu, 31 Dec 2015 05:49:59 -0500 https://reprap.org/forum/read.php?292,601693,602616#msg-602616 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602616#msg-602616
Perhaps that is problem. I use Skeinforge that has no minimum speed, so never need to use a fan for ABS and can print very small items.]]> nophead Mendel90 Wed, 30 Dec 2015 16:12:37 -0500 https://reprap.org/forum/read.php?292,601693,602541#msg-602541 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602541#msg-602541
In this situation and for the part the OP asked about at the start of this thread, I wouldn't recommend a fan for ABS. I would simply print it slower as we have already discussed -- with the problem area of this part at a minimum speed of 10 mm/s, the smallest layer would take over 20 seconds (probably closer to 25). Slic3r will try to satisfy the minimum layer time by lowering the speed until the calculated print time of the layer is less than the minimum print time, but it will never lower the speed below the minimum speed. In this case if you set the minimum speed to 10 mm/s and the minimum layer time to 20 seconds (or even 15), it will print just fine without going down the rabbit hole of a fan with ABS.]]> daichiasuka Mendel90 Wed, 30 Dec 2015 13:19:36 -0500 https://reprap.org/forum/read.php?292,601693,602422#msg-602422 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602422#msg-602422
There is a lot of myth in the 3D printing community relating to many things that should, and should not, be done. There is much advice that is not appropriate to modern materials or hardware and you need to make determinations for yourself.

Yes, using a fan with ABS can be a potential cause of de-lamination but if you are in a situation where there is excess heat in the deposition of the material and removing some of that heat, by using a fan, helps then there is no reason not to. You need to assess, for yourself, whether doing so is detrimental to the object you are printing.

There are rules that say you cannot print layer heights greater than 80% of your nozzle diameter or that layer Width/Height should be close to 1.5. These are all rules that I break because I know that I can do so safely.

The original Wade's block for my Mendel90 kit which nophead printed at 240C+ and 0.4mm layer height (using a nozzle diameter bigger than 0.4mm) failed within 6 months. I replaced that with one printed at 220C and 0.4mm layer height using the standard Mendel90 0.4mm J-Head and that Wade's block is still in service two years later.

When you are given a rule to follow, you should asses the logic behind that rule but do not blindly follow the rule if the logic is not sound.

Regards,
Neil Darlow]]> neildarlow Mendel90 Wed, 30 Dec 2015 06:39:34 -0500 https://reprap.org/forum/read.php?292,601693,602395#msg-602395 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602395#msg-602395 danielis Mendel90 Wed, 30 Dec 2015 05:02:41 -0500 https://reprap.org/forum/read.php?292,601693,602179#msg-602179 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,602179#msg-602179 neildarlow Mendel90 Tue, 29 Dec 2015 14:47:32 -0500 https://reprap.org/forum/read.php?292,601693,601955#msg-601955 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601955#msg-601955
Do you have your fan fully on during the under 5 sec layers?

Thanks.]]> demetris Mendel90 Tue, 29 Dec 2015 03:20:29 -0500 https://reprap.org/forum/read.php?292,601693,601949#msg-601949 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601949#msg-601949
I think I could print that object at 220C with a minimum layer time of 5 seconds and minimum print speed of 10mm/s and I would have the fan enabled for layer times of 5 seconds or less (even for ABS). The Reprappertech ABS I use can cope with these conditions.

Regards,
Neil Darlow]]> neildarlow Mendel90 Tue, 29 Dec 2015 03:17:11 -0500 https://reprap.org/forum/read.php?292,601693,601925#msg-601925 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601925#msg-601925 demetris Mendel90 Tue, 29 Dec 2015 00:23:57 -0500 https://reprap.org/forum/read.php?292,601693,601905#msg-601905 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601905#msg-601905
When I print tiny areas my printer slows down so much each step is a tick. I.e. speed goes to almost zero to allow very small areas to take 20s.]]> nophead Mendel90 Mon, 28 Dec 2015 21:29:56 -0500 https://reprap.org/forum/read.php?292,601693,601858#msg-601858 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601858#msg-601858
Quote
nophead
>slowest perimeters are still at over 700 mm/s

That is way faster than the printer can move!

Typo. :) 700 mm/min

As nice as the Mendel90 is, I will agree that it cannot move nearly that fast.]]> daichiasuka Mendel90 Mon, 28 Dec 2015 17:38:33 -0500 https://reprap.org/forum/read.php?292,601693,601851#msg-601851 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601851#msg-601851
That is way faster than the printer can move!]]> nophead Mendel90 Mon, 28 Dec 2015 17:06:55 -0500 https://reprap.org/forum/read.php?292,601693,601805#msg-601805 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601805#msg-601805
Quote
daichiasuka
I've never had to use a dummy object, but I've never fully understood this logic.

I don't want to waste material. The reasons are not only economical. If I am able to pull it off without that then it makes much sense.]]> demetris Mendel90 Mon, 28 Dec 2015 14:19:39 -0500 https://reprap.org/forum/read.php?292,601693,601795#msg-601795 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601795#msg-601795
Quote
demetris
The second solution might work but that means I have to print a dummy object that I don't need and waste plastic. I am sure people here have successfully printed this.

I've never had to use a dummy object, but I've never fully understood this logic. Even if I grossly overestimate the cost, a 10 mm x 10 mm x 100 mm column of solid plastic would cost less than $0.50 (USD) in plastic. Your failed print probably cost you more than that already.

That said, I'm with nophead. Slicing in my slicer of choice at 20 second minimum for layers shows the slowest perimeters are still at over 700 mm/s. Increase your minimum print time per layer.]]> daichiasuka Mendel90 Mon, 28 Dec 2015 13:56:16 -0500 https://reprap.org/forum/read.php?292,601693,601773#msg-601773 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601773#msg-601773 nophead Mendel90 Mon, 28 Dec 2015 13:18:53 -0500 https://reprap.org/forum/read.php?292,601693,601767#msg-601767 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601767#msg-601767 demetris Mendel90 Mon, 28 Dec 2015 13:12:21 -0500 https://reprap.org/forum/read.php?292,601693,601763#msg-601763 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601763#msg-601763
What plastic are you using?]]> nophead Mendel90 Mon, 28 Dec 2015 13:06:47 -0500 https://reprap.org/forum/read.php?292,601693,601753#msg-601753 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601753#msg-601753
The second solution might work but that means I have to print a dummy object that I don't need and waste plastic. I am sure people here have successfully printed this.]]> demetris Mendel90 Mon, 28 Dec 2015 12:46:33 -0500 https://reprap.org/forum/read.php?292,601693,601722#msg-601722 Re: Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601722#msg-601722
You could also just print something else at the same time like another part you need or even just a column.]]> daichiasuka Mendel90 Mon, 28 Dec 2015 11:39:28 -0500 https://reprap.org/forum/read.php?292,601693,601693#msg-601693 Help printing e3D fan duct https://reprap.org/forum/read.php?292,601693,601693#msg-601693
[attachment 68417 e3d_fan_duct.jpg]

Do you have any suggestions that might help me print this? Thanks.]]> demetris Mendel90 Mon, 28 Dec 2015 10:32:06 -0500