Find some DIY electric kiln tutorials and almost (but not quite) do what they say. Sometimes it's best not to follow directions.]]>Anyway, probably derailing this topic a bit...
]]>As for the pcb and the power supply, if we are to be concerned about those then wr all should be flipping off the master on our electrical service panels in our homes anytime we leave or sleep. Nearly every piece of tech in our homes has a similar supply and pcb's that are powered but in sleep mode all the time.
]]> Find some DIY electric kiln tutorials and almost (but not quite) do what they say. Sometimes it's best not to follow directions.]]>Oven range might help as a heated enclosure (with electronics outboard)
And I like your thermal fuse setup. Very simple and effective.
]]>One option would be to use an external temperature controller wired to the outlet where you plug in the unit. If the temperature gets above a certain limit, it would completely cut power to the machine. The only problem with temperature controllers like that is once it gets below the limit it would flip the machine back on, essentially turning the printer on and off to maintain a constant temp.
I will have to look into it a little later, see if there's an easy latching solution where it will cut power over a certain temp and run independently to the printer itself.
I have built an external system using multiple 129C thermal fuses deployed at the PSU, Control Board, and Hot End. See my earlier posts in this thread:
http://www.soliforum.com/topic/6628/fir … re/page/2/
I also have a fire extinguisher set up over the top of the unit; but still, these are just extra precautionary steps and I still never leave a print overnight. As elmoret stated, the only ONLY way to address unattended printing is to buy or build a fireproof cabinet for the printer...
]]>I will have to look into it a little later, see if there's an easy latching solution where it will cut power over a certain temp and run independently to the printer itself.
]]>Great. Thanks for this. So it will protect for a stuck mosfet, and the later code will looks for extreme misreadings that could be a bad thermister.
FYI...Thermal runaway and maxtemp settings do offer some level of protection, but NOTHING will shut down your heater if a mosfet has failed in the ON condition...in that situation, if the printer is plugged into an outlet, it's powering the heater.
]]>Great. Thanks for this. So it will protect for a stuck mosfet, and the later code will looks for extreme misreadings that could be a bad thermister.
I have very limited knowledge in coding. Is there a way to put some lines in that state if it is calling for a temp and that temp is not reached after a set amount of time it will abort heating ad the build? Would seem simple to add. Although again I knwo very little about coding.
carl_m1968 wrote:curlrup wrote:It works perfectly fine now. Turns on comes to temp, shuts off. Works fine. I really think it is another shorted cable. Since I have replaced almost every other cable in the machine because of shorts. If thermal shut off is in the firmware it should watch for not seeing temps rise or so much above the set point. I know certain flavors of Marlin and Sailfish have that feature. Wondering if Repetier Firmware has this feature so I can print in peace.
This should answer your question. Taken from copy of Repetier although I use Marlin when I can.
// When temperature exceeds max temp, your heater will be switched off.
// This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
#define MAXTEMP 260/** Extreme values to detect defect thermistors. */
#define MIN_DEFECT_TEMPERATURE -10
#define MAX_DEFECT_TEMPERATURE 300
Great. Thanks for this. So it will protect for a stuck mosfet, and the later code will looks for extreme misreadings that could be a bad thermister.
I have very limited knowledge in coding. Is there a way to put some lines in that state if it is calling for a temp and that temp is not reached after a set amount of time it will abort heating ad the build? Would seem simple to add. Although again I knwo very little about coding.
carl_m1968 wrote:curlrup wrote:It works perfectly fine now. Turns on comes to temp, shuts off. Works fine. I really think it is another shorted cable. Since I have replaced almost every other cable in the machine because of shorts. If thermal shut off is in the firmware it should watch for not seeing temps rise or so much above the set point. I know certain flavors of Marlin and Sailfish have that feature. Wondering if Repetier Firmware has this feature so I can print in peace.
This should answer your question. Taken from copy of Repetier although I use Marlin when I can.
// When temperature exceeds max temp, your heater will be switched off.
// This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
#define MAXTEMP 260/** Extreme values to detect defect thermistors. */
#define MIN_DEFECT_TEMPERATURE -10
#define MAX_DEFECT_TEMPERATURE 300
They are already there. the temp has to stay in a certain zone for X amount of time before printing will start. If it cannot be kept in that zone/range then it will not start printing.
/** Temperature range for target temperature to hold in M109 command. 5 means +/-5 degC
Uncomment define to force the temperature into the range for given watchperiod.
*/
//#define TEMP_HYSTERESIS 5
So unless temp stays within +/- 5 degrees of set point printing will not start. Of course that could be set to any range such as 10 or even 2. But at 2 you may never print seeing as how unstable some of these units are.
]]>I have very limited knowledge in coding. Is there a way to put some lines in that state if it is calling for a temp and that temp is not reached after a set amount of time it will abort heating ad the build? Would seem simple to add. Although again I knwo very little about coding.
curlrup wrote:It works perfectly fine now. Turns on comes to temp, shuts off. Works fine. I really think it is another shorted cable. Since I have replaced almost every other cable in the machine because of shorts. If thermal shut off is in the firmware it should watch for not seeing temps rise or so much above the set point. I know certain flavors of Marlin and Sailfish have that feature. Wondering if Repetier Firmware has this feature so I can print in peace.
This should answer your question. Taken from copy of Repetier although I use Marlin when I can.
// When temperature exceeds max temp, your heater will be switched off.
// This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
#define MAXTEMP 260/** Extreme values to detect defect thermistors. */
#define MIN_DEFECT_TEMPERATURE -10
#define MAX_DEFECT_TEMPERATURE 300
It works perfectly fine now. Turns on comes to temp, shuts off. Works fine. I really think it is another shorted cable. Since I have replaced almost every other cable in the machine because of shorts. If thermal shut off is in the firmware it should watch for not seeing temps rise or so much above the set point. I know certain flavors of Marlin and Sailfish have that feature. Wondering if Repetier Firmware has this feature so I can print in peace.
This should answer your question. Taken from copy of Repetier although I use Marlin when I can.
// When temperature exceeds max temp, your heater will be switched off.
// This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
#define MAXTEMP 260
/** Extreme values to detect defect thermistors. */
#define MIN_DEFECT_TEMPERATURE -10
#define MAX_DEFECT_TEMPERATURE 300
Btw, you are very lucky...although not always practical, unattended printing is not advised for this very reason!
]]>Thanks
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