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Printrbot Simple Metal extruder fan cover/mount

by mattbeechan, published

Printrbot Simple Metal extruder fan cover/mount by mattbeechan May 22, 2014
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Summary

While printing on my Printrbot Simple I found that on longer prints my extruder would start skipping. It wasn't filament jamming, it was the motor itself skipping. So on advice of the community I decided to test a fan pointed at my extruder motor to keep it cool. After the cooling fan was installed, my motor no longer skipped.

I used the existing y-arm bolts to secure the mount.

This is the fan I purchased and it works perfectly. http://www.amazon.com/gp/product/B000RD0RDU/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1

I removed the pins from the wire connector on the fan and inserted them into the fan connector about 6 inches down the wire harness.

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My extruder isn't heating up. It was working well two hours into a four hour print (and I've done 10 hour prints before), then stopped.

Do you think it overheated and burned out? I wonder if this fan would have saved it!!! :-)

Also, I'm not good with electronics. In simple terms: How would I connect the new fan's wires?
Thanks!!!

I downloaded the .stl and put it in Repetier and but the "P" and part of the model that bolts to the Printrbot is missing when I slice it. Anyone else have this issue? Is it possibly a setting?

I was having trouble with that as well. I had to fix the part in Netfabb to get it to slice correctly, otherwise the P was filled in.

Want to share the .stl?? Haha, I don't have/or can afford Netfabb. Unless you know of a free program that can do the same thing?

There's a free Netfabb Basic version. Shapeways has a walk though on repairing STLs. I can link to the article later if you need it.

Oh cool, thanks!

Thanks so much for the info InfamousChicken! Got the .stl file fixed. Now just if I can keep sane while I wait for my Simple to come Thursday.....

Thanks for the design! Is it possible to wire this to somewhere so it's on all the time?

I currently have a fan mounted to the front and it works great. Can you give a little more info about your wiring? I wired mine directly to the power wires. Did you connect to the other fan's wires? Doesn't that mean the fan will only run on and off with the other fan?

I have it wired into the connector for the print fan. Because of this, it will only run when the other fan is on. I have adjusted my cooling settings so that when I'm running a longer print I slice with a different 'Always on' gcode. I attempted to wire into my board but ran into issues with the printer shutting off intermittently and canceling the print.

How did you wire the connection? Did you use a splitter?

Aug 21, 2014 - Modified Aug 21, 2014

My fan had pins on the harness so I just piggybacked it off the bed fan connector.

Isn't it also possible to connect the fan (if it's a 12V one) to the heated bed connector, given that the Simple doesn't have a heated bed? This way you only need to turn on the bed temperature to provide it with power?

hmmmm I wonder this as well. Only problem is that if the printer isn't getting a proper signal test from a thermistor it won't turn the heated bed on. I'm going to say you can't hook it up to the heated Bed connection. Unless you trick it into thinking its actually powering a bed somehow.

You can easily 'trick it' by attaching a 100K fixed resistor to the T-BED jumper and attaching your fan to the heated bed connector on the printrboard.
Then you use:
M140 S60
to turn on the fan and:
M140 S0
to turn it off.
I'm running this setup for my extruder cooling fan on my Simple Maker edition.

Ah great info, any chance you could upload a pic on how the resistor is attached to the printrboard?

Well you do need to hook up a thermistor to the Heated Bed thermistor plug so that it can read temperature and indeed will allow you to put power to the bed. How did you connect it to the power wires?

would it be possible to upload a version without the logo? :D

Looks like Adafruit beat me to it. They remixed a blank.

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