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Robo3D low profile 40mm fan duct

by galaxius Aug 17, 2014
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I used a 1/4 wood dowel and pre-drilled the hole and used a wood screw. Works great and much better prints.

I'm fighting extruder temp crashing running both fans. When I try adjust them down, away from the extruder, they are a bit too low and can interfere with the print. I'm a bit stumped. I can run the fans at 45%, but that defeats the purpose. I just cannot dial in the fan direction to keep it on the part and away from the head. R1+. From what I understand, that means I have a hexagon head, but do not know how to confirm.

The Hexagon hotend comes with a black silicon sleeve for the heater block, you can see it in some of the pics, that makes a huge difference to maintaining temp. If you don't have the sleeve you could probably wrap several layers of kapton tape around the heater block. If the ducts hang too low when angling them further away from the nozzle you could sand/cut some off the end of the duct possibly. I wanted the ducts to begin cooling the extruded plastic as soon as it leaves the nozzle, which then presents the temp crash challenge.

I use to have all sorts of temp crashing before I even put a duct on and that was due to the then stock J-Head hot end. Once I upgraded that to a Hexagon with the silicon sleeve (now the default with the R1) the majority of my temp crashing disapeared. I then changed the heating circuit to an SSR and the heating values in the firmware which decreased my heat up time and further stabilised my hotend temp. But, with 2 ducted fans blowing on the nozzle I still experience some temp crash, which I've reduced to just 4 deg C by ramping up the fan over a couple layers (something like layer 2 70%, layer 8 100%).

I hope that gives you some ideas.

How do you have your extruder fan mounted? With the way mine is, I can't add the fan duct to the front.

Here's what it looks like: http://i.imgur.com/Ji8gjqD.jpg

Does this fan duct setup reduce the Z height at all? I have the new R1

Because the ducts stick out a bit they will hit on the top of the Robo3D case. I run my Robo3D without the top. If you want to print something with a high Z height you can remove the top of the Robo3D, but the newer R1's have stabilisers for the Z rods built in and lighting etc.

There's another fan duct design for the Robo3D that should be slimmer than mine and his instructions say it shouldn't hit the top. It's not angle adjustable though. http://www.thingiverse.com/thing:821080

3D ROBO R1 Dual Fan Mount "Black Widow" 10mm and 20mm fan setups

where do you find the 6mm rod to mount this thing.... I can't seem to find one anywhere?

In Australia, Bunnings. It's a big hardware chain. I'm not sure what the equivalent is in the US or other countries.
The 6mm aluminum rod isn't necessary, it's just better than a nut.

where do you find the 6mm rod to mount this thing.... I can't seem to find one anywhere?

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