Overtemp protection

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jdurand
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Overtemp protection

Postby jdurand » Mon Dec 15, 2014 3:06 pm

I've seen some concern here and there about 3D printers in general burning up hot ends on thermistor failure and/or being a fire hazard.

How about running the heater power through a thermal fuse and mount that in contact with the heat sink above the heat break? This way if the cooling fan fails or the thermistor fails or the software crashes, the fuse blows and kills the heat.

Cheap insurance.

Example of one here
http://www.aliexpress.com/item/2014-New ... 70748.html
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BenTheRighteous
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Re: Overtemp protection

Postby BenTheRighteous » Mon Dec 15, 2014 3:21 pm

That seems like a damn good idea to me!
nitewatchman wrote:it was much cleaner and easier than killing a chicken on top of the printer.

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Jimustanguitar
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Re: Overtemp protection

Postby Jimustanguitar » Mon Dec 15, 2014 3:24 pm

I like it, that's a great idea!

If you have a single heater cart instead of the 2 'stock' resistors, you could load a fuse like this in the leftover hole from the second resistor...

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heathenx
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Re: Overtemp protection

Postby heathenx » Mon Dec 15, 2014 5:05 pm


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jdurand
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Re: Overtemp protection

Postby jdurand » Mon Dec 15, 2014 5:14 pm

Seems like the long way around, a $0.20 thermal fuse seems easier and certainly cheaper.
Standing on the edge of reality... (me)
Quando omni flunkus moritati (Red Green)
Let no man belong to another that can belong to himself. (Paracelsus)
All things are poison and nothing is without poison; only the dose makes a thing not a poison. (Ibid.)

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Captain Starfish
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Re: Overtemp protection

Postby Captain Starfish » Mon Dec 15, 2014 5:16 pm

Jimustanguitar wrote:I like it, that's a great idea!

If you have a single heater cart instead of the 2 'stock' resistors, you could load a fuse like this in the leftover hole from the second resistor...


I think the idea is more to pop it up where it should be cool during normal operation, so it only blows when things get seriously out of control.

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Eaglezsoar
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Re: Overtemp protection

Postby Eaglezsoar » Wed Dec 17, 2014 4:01 pm

Simple yet effective. That should be implemented on all printers as the protection is immense and the cost is extremely small.


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