Hot end cooler for Solidoodle2

by m4rten86, published

Hot end cooler for Solidoodle2 by m4rten86 Mar 23, 2013
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This is an invention to cool down the plastic that comes out of the hot end with cool enviromental air ( room temperature). This is very good for printing small objects faster. Also I experienced that it's possible to print about 30mm in horizontal direction.
So you can setup the bridge distance in slic3r to a bigger distance and it's easier to remove these after printing :-)

The electric controll is based on the Gcode conrolled Fan Mod of Ian Johnson (http://solidoodletips.wordpress.com/2012/10/26/gcode-controlled-extruder-fan/)
but instead of a Fan i used a relais that switches an air pump for aquaria. there are really cheap ones for only 10Euro ( about 13$).

I designed the Tubes (i wasnt supposed to look like .... ! :D ) and they really fit very well with a glue simply made of Aceton and ABS plastic.
Also it looks good when you paint them in copper or iron colours. ;-)


You need :

-Air pump ( i used a 66 Gallons/hour, 5Watt, Membranepump, bought at Amazon for 10Euro)
( http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=air+pump+aquarium&rh=i%3Aaps%2Ck%3Aair+pump+aquarium )
-All the parts for Ians Guide ( but not the fan)
( http://solidoodletips.wordpress.com/2012/10/26/gcode-controlled-extruder-fan/ )
-12V DC relais (you have to take a look how much power your pump has to buy a relais that can switch that power.
-A flexible tube (inner diameter 4mm, outer 6mm)
-A glue that dry´s very quick. I used a acetone and ABS mixture.

For the electric part you just have to follow Ian Johnsons guide but instead of connecting the Fan you connect the 12V relais ( you can also use a transistor or something like that ;-) ) . Take a look at the scam for detailed informations.
After the hardware is connected, its very important to set up the controll of your "fan" (in our case the air pump). I can only say how to adjust it in the Slic3r Menu (which Repetier-Host uses for example) : Go in your Slic3r Settings->Filament Settings->Cooling
Then you do the following adjustments:
-Fanspeed minimum to 100
-Fanspeed maximum to 100
-Bridges fan speed to 100%
-Disable fan for the first 1 layers ( maybe adjust to 2, you have to see how the layer behave)

I exchanged my Hot Head against this one http://www.thingiverse.com/thing:33152 from tek so if you have another hot head you may have to customize this cooler tube system.

If you have any questions, just ask me per pm or in the Comments.

P.S. : Sorry for my bad english, but i learned it in school 10 years ago :)

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Ok...I have to admit...it looks a little stupid (no offense). BUT! It works really well, this fixed so many problems on my printer and ="thingiverse-d1b8f0be175020bc1d1f0a188b6476f1:disqus" href="http://disqus.com/thingiverse-d1b8f0be175020bc1d1f0a188b6476f1/m4rten86 I thank you for that.

hi could you send a photo how your hot end looks like with that system ?

Good idea! Is it just me or those air nozzle look like... Nevermind lol...

Could you give us some details on the pump you are using? Brand, model, air flow rating etc...

Hi, thanks for your intrest : ) i will add the data of the pump in the main description.

Hi, thanks for your intrest : ) i will add the data of the pump in the main description.

oh dear, another 'just use an automotive relay and be done with it'. Am I right assuming that your electrical knowledge does not reach much further than 'a relay is a remote controlled switch'?
The point is, relays are really old tech, like using a steam-valve on a modern hybrid engine. The first thing to do would be not to use mains voltage. If all you can think of is a relay to switch mains, you should probably not be handling it: that stuff is dangerous if you don't know what you are doing.

One step up is to use a solid state relay. Not very sophisticated, but it will not wear out like a mechanical one and can switch much faster already.

Oh dear, what´s wrong with you ? :-D Go outside and learn some social behavior ! We are a community and should develope together but i think its too late telling you that ...

P.S. : I am a trained german electrician and I know what i am doing.
We dont need a high frequent switch so the relais won´t wear out in the next 10 years. Further more its much easier for everyone to realize the electrical part with a 12V relais because it can switch every current potential free. So everyone can use the pump that he got at home or get in a store around the corner..

The viciousness of your response suggests I'm right.

M106 S150 <- there is another reason why a relay is not a very good solution.

ok this comment is a little nicer :) i will add an image how to solve that problem, thanks for your info :)