40mm fan redirect vent Replicator 2 Stepstruder Mk8

by Gozeeta, published

40mm fan redirect vent Replicator 2 Stepstruder Mk8 by Gozeeta Jan 3, 2013
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Update 10/8/13:- Sorry this took so long, fredzemail74 made his own redirect vent that I actually like better (thanks, fred): http://www.thingiverse.com/thing:107080
The difference in airflow is noticeable, though I haven't printed as much since that replacement. Research on whether or not my thing is detrimental to the fan long-term has not been done. Y'all should try both and see which you like.

My larger prints were lifting from the platform because the fan from the stepstruder was blowing cool air off the metal frame and onto the build platform, cooling the PLA more than needed. This vent forces the exhaust upwards and minimizes that effect. At 5mm it's the same thickness as the existing chrome grill and a replacement for it. The .stl and .sldprt has a blank face but I added a P for style pointz.


These were just the settings I used. I haven't tried with others because it worked the first time (luckily)
In MakerWare:
Medium slicer with support enabled
20% infill, 2 shells
.25mm layer thickness
default temps and speeds
placed in the back right corner (warmest part of the build plate)

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Not trying to sound demeaning or anything but...this has to block at least 95% of the air flow from the fan. I'm not sure anyone should be using this. I do like your concept though. I too have noticed that turning the fans around and making them pull heat away from the heat sink dramatically improved my prints. It keeps air from swirling around the print head and prematurely cooling the extruded plastic. This lead me to try and vent as much air as I could out of the machine. I've made my own fan ducts to blow the air straight up and out of the print area. I'll have to post them. They just press on over the fan body. They have a much larger opening for air flow.

Is that necessarily bad? I can understand that if it had to draw air THROUGH the vent it's undesirable. It's as if no matter what direction the air moves (besides up) it's no good. So now to find the best way to move the air up...
Thanks for the input!

I think it probably is. You've blocked the air flow in either direction. I made sure my fans were drawing air through the heat sink away from my print heads and then designed the ducts in the link here http://www.thingiverse.com/thing:107080http://www.thingiverse.com/thi...

Check em out....they work great and I still have plenty of air flow. Been using them for a couple weeks now. Much better prints!

40mm Fan Duct - Replicator 2X

I was able to print this without supports and it also seemed to be a little bit stronger at 100% infill.

Excellent. I was cautious about no support because I've had prints with less draft fail. As far as strength I felt that a minimal amount was necessary, and that the PLA wasn't mine to spend, but my company's. Has it had any affect on how the piece fits?

The first one fit great but I have since made another, just haven't had the chance to use it yet. Right after I put the original one on our plunger decided to fail for the first time since makerbot replaced our entire extruder assembly after christmas. We actually have a 2nd extruder assembly but as opposed to replacing the entire thing, I just went back to the modified spring/bearing setup. I will get back to you asap though and likely post a derivative. I really wanted to let you know, I appreciate your making this, back in December when we were having endless plunger issues, I took apart that extruder assembly hundreds of times, literally hundreds. You can bet I hit the fan with the allen wrench more than once, luckily I have a few fans. I am interested to see how it affects peeling. If it isn't issues with the plunger... keeping the build plate level is the 2nd thing about this bot that has eaten away at my soul, 2 of the 3 plates we have received have been warped and I believe now our biggest issue is the felt pads but we recently ordered a glass plate. Anyway, when the build plate is as close to perfect as possible, we still get issues with peeling, it all depends on the print I guess.

Apparently you've discovered that it also protects the fan from poking with the allen wrench, something that i never even considered cause it wasn't a problem for me, but great, and sorry I didn't think of this before you went through a couple fans! And at least your build plate had felt pads; mine were missing and I had no idea haha. The spring/bearing upgrade is next on my list.

I think your fan is back-the-front it is supposed to be blowing into the heatsink. The other fan - the blower is what cools the PLA on the build plate. You can turn it off during the print by clicking the left button in the menu and scrolling down.

Quite possible! Though it was installed blowing out and I can understand drawing air through the heat sink first, flipping it around may be an even simpler solution than mine! As for turning off the fan manually, I do that almost every time. It's a bummer that it's not an option with Miracle Grue. If I wasn't able to babysit it and wait for the moment to turn off the fan I would slice it with Skeinforge instead.