<![CDATA[SoliForum - 3D Printing Community — Constant overhang failure]]> https://www.soliforum.com/topic/6253/constant-overhang-failure/ Sun, 27 Apr 2014 19:15:31 +0000 PunBB <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55185/#p55185 Thanks, that would be most helpful.

]]> Sun, 27 Apr 2014 19:15:31 +0000 https://www.soliforum.com/post/55185/#p55185 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55180/#p55180 MungoBBQ wrote:

Actually, after tinkering with it for a bit, it turns out it's quite the other way around. smile

I managed to solder the cables on to the board, and the fan is now spinning when I turn it on in Repetier Host, so that's good.

However, the mount and the fan holder that I've printed simply will not fit the SD4. The round part will not go around the hotend, there's just no room. And the holes in the mount part are not lined up with anything on the extruder.

Did anybody make new parts for the SD4?

Take a picture of your SD4 hotend. If it's like my newer sd3 hotend you won't find fan mounts on thingiverse that fit it, but I made some custom fan holder I can send you stl for

]]> Sun, 27 Apr 2014 17:06:39 +0000 https://www.soliforum.com/post/55180/#p55180 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55179/#p55179 Actually, after tinkering with it for a bit, it turns out it's quite the other way around. smile

I managed to solder the cables on to the board, and the fan is now spinning when I turn it on in Repetier Host, so that's good.

However, the mount and the fan holder that I've printed simply will not fit the SD4. The round part will not go around the hotend, there's just no room. And the holes in the mount part are not lined up with anything on the extruder.

Did anybody make new parts for the SD4?

]]> Sun, 27 Apr 2014 17:02:14 +0000 https://www.soliforum.com/post/55179/#p55179 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55174/#p55174 Well I've got a fan now (they were hard to find here in Sweden). Does anybody have a pointer on how I should connect this to my SD4? The guides I find are for SD2 and my printer looks different.

I've printed a mount which will work, but I've got three cords (yellow, red, and black) coming out of the fan and I'm not at all sure where I can connect them on my printer?

]]> Sun, 27 Apr 2014 14:00:24 +0000 https://www.soliforum.com/post/55174/#p55174 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55091/#p55091 Oh OK, I see now. Thanks everybody, I'll see if I am clever enough to mod it. smile

]]> Fri, 25 Apr 2014 17:25:41 +0000 https://www.soliforum.com/post/55091/#p55091 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55088/#p55088 MungoBBQ wrote:

I've got a fan on the extruder, it came mounted with my SD4, but I'm guessing this is what not you are talking about since this fan is going non-stop from the moment I plug the printer in?

No

More info here.

http://www.soliforum.com/topic/204/fan-installation/

]]> Fri, 25 Apr 2014 16:55:53 +0000 https://www.soliforum.com/post/55088/#p55088 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55086/#p55086 I've got a fan on the extruder, it came mounted with my SD4, but I'm guessing this is what not you are talking about since this fan is going non-stop from the moment I plug the printer in?

]]> Fri, 25 Apr 2014 16:52:07 +0000 https://www.soliforum.com/post/55086/#p55086 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55083/#p55083 grob wrote:

Usually the fan is a small computer fan (40mm is common) attached to the extruder, and blows air from inside the enclosure in a focussed stream near the nozzle. The fan is controlled by the board (slic3r has settings for this) to only run when it's required. The thingiverse link will help you achieve this.

^great explanation


While the fan can be controlled by the board you most certainly do not have to have it do it this way. It will work just fine running off an external power source.

]]> Fri, 25 Apr 2014 16:19:17 +0000 https://www.soliforum.com/post/55083/#p55083 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55067/#p55067 For overhangs and bridges, a fan helps to cool the plastic coming out of the nozzle faster, which is a good thing - it makes them firm up quicker, which reduces droop and dropped loops (which looks like what's happening in your pictures).

Usually the fan is a small computer fan (40mm is common) attached to the extruder, and blows air from inside the enclosure in a focussed stream near the nozzle. The fan is controlled by the board (slic3r has settings for this) to only run when it's required. The thingiverse link will help you achieve this.

In general, you want to keep the heat in the enclosure yes, so the whole part cools as slowly as possible and doesn't crack/warp/break off the bed. Putting a desk fan next to the printer blowing air from the room is likely to create more problems than anything, so I'd avoid that as your instincts suggest! smile

]]> Fri, 25 Apr 2014 14:40:50 +0000 https://www.soliforum.com/post/55067/#p55067 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/55064/#p55064 Hm, but I thought that the heat was needed for the print to stick, and the enclosure is to ensure that there is no draft to make the print wobbly? If I add a fan, won't that mess upp other things?

]]> Fri, 25 Apr 2014 14:16:38 +0000 https://www.soliforum.com/post/55064/#p55064 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/54895/#p54895 DePartedPrinter wrote:

The simplest solution for this is to get a fan and aim it at the part as it prints.

If you want better results get something like this put together...http://www.thingiverse.com/thing:30828

+1...alternatively, you may want to try .15 resolution - infill every 2 layers.

]]> Wed, 23 Apr 2014 20:15:16 +0000 https://www.soliforum.com/post/54895/#p54895 <![CDATA[Re: Constant overhang failure]]> https://www.soliforum.com/post/54894/#p54894 The simplest solution for this is to get a fan and aim it at the part as it prints.

If you want better results get something like this put together...http://www.thingiverse.com/thing:30828

]]> Wed, 23 Apr 2014 20:10:45 +0000 https://www.soliforum.com/post/54894/#p54894 <![CDATA[Constant overhang failure]]> https://www.soliforum.com/post/54892/#p54892 I can't seem to print anything with even the slightest overhang on my SD4.

This print was made using .100 resolution with ABS plastic, 200C extruder, 100C bed, but I've tried many different settings - both other layer heights and slower speeds.

As soon as the tiniest overhang comes, there is upward curling which leads to the nozzle bumping into the plastic on the next layer, leading to complete failure as seen in the picture. :(

As you can see, the print was going fine otherwise.

What can I do to improve this? Slower speed doesn't seem to help. Could I be over-extruding? Are my temperatures off? I'm grateful for any help.

]]> Wed, 23 Apr 2014 20:01:25 +0000 https://www.soliforum.com/post/54892/#p54892