Enraged wrote:with a 40W cartridge, what about "printing" circuits with solder?
bdring wrote:I have had problems in the past where a controller locked up when a heater was on. I was right there and saw that the printer had stopped so it did not damage anything. I think my problem was due to something on the USB like noise or ESD.
With number of units MakerBot sells I can imagine they had a few over temp problems or even fires.
bdring wrote:I have had problems in the past where a controller locked up when a heater was on. I was right there and saw that the printer had stopped so it did not damage anything. I think my problem was due to something on the USB like noise or ESD.
With number of units MakerBot sells I can imagine they had a few over temp problems or even fires.
***We are already producing some of the components so we have a head start...we plan to begin shipping soon after the campaign completion (first in first out)***
mattrsch wrote:They do, but since they are a stand alone system, there is nothing preventing you from throwing one on one of these extruders. All you need is one of the thermostats: http://store.makerbot.com/mk6-thermostat.html
and their relay board: http://store.makerbot.com/safety-cutoff-switch-kit.html
It looks like the thermostat just attaches to the extruder mounting plate.
Boxcar wrote:Wouldn't these thermal fuses work? http://www.ebay.com/sch/i.html?_nkw=the ... acat=12576
Liberty4Ever wrote:Boxcar wrote:Wouldn't these thermal fuses work? http://www.ebay.com/sch/i.html?_nkw=the ... acat=12576
A thermal fuse would work... once! A thermostat or thermal switch cycles on and off at a set temperature with a hysteresis band between ON and OFF. The thermal fuse is similar to an electrical fuse. It's a safety device, not a control device. When it blows, it needs to be replaced. Thermisters or thermocouples are temperature sensors. They don't interrupt the flow of power to the heating element. The sensors tell the controller what the temperature is, and the controller uses that information to control the flow of power to the heater. Using a thermal sensor (typically a thermistor on a 3D printer) allows the temperature setpoint to be changed depending on what material is being extruded. It sounds like the Makerbot thermostat is set to trip above the normal operating temperature but below the danger temperature where a fire could start. If you look at it as a one time emergency, a properly specified thermal fuse would work. If you expected intermittent control problems, a thermostat would be cheaper and less hassle in the long term... but I'd want to fix the errant control problem.
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