Hello.
I recently bought 10 100k thermistors. It wasn't until I received them that I realized they were only rated up to 125 C. But, although I really can't use them for my heated bed or hot end, I still managed to find something useful to use them for. I have heard many different opinions on whether or not a heat sink should be used. Of course we all agree a fan is without question beneficial. So I figured I would put together a little scientific experiment for all of our beneift. :D
I wired up one of the thermistors to T1 and since I am not currently using a heated bed I can use the bed temp readings in Repetier to monitor the temp of my thermistor. I removed a driver and carefully placed the thermistor right under the little PCB, underneath the driver. After letting it settle into the temperature of the driver with no power to it I got my notepad out and got started. FYI before I began I checked the accuracy of the thermistor just in case I got the settings wrong in the firmware, and after comparing it to my hot end temp and a control (me) I verified it to be accurate.
Here is the set up that will be tested.
Arduino Mega/Ramps 1.4
Drv8825 @ 1/16 set to 1.0v
PSU @ 12v
X axis > Nema 23(Rated 2.5a per/phase)
I took readings every 10 minutes for 30 minutes total with a complete cool down period in between each configuration.
*All Temperatures are in Celsius*
No Heatsink (No cooling Fan):
Temp @ 0min - 26
Temp @ 10min - 86
Temp @ 20min - 90
Temp @ 30min - 91.2
Heatsink (No cooling Fan):
Temp @ 0min - 26.9
Temp @ 10min - 85
Temp @ 20min - 91.4
Temp @ 30min - 91.8
No Heatsink (Cooling Fan ON):
Temp @ 0min - 26.3
Temp @ 10min - 58.9
Temp @ 20min - 61.7
Temp @ 30min - 62.5
Heatsink (Cooling Fan ON):
Temp @ 0min - 26.4
Temp @ 10min - 53
Temp @ 20min - 54
Temp @ 30min - 53.5
I plan on expanding on this experiment over the next few days. So, if anyone has any suggestions, questions, or requests please feel free to let me know.
I recently bought 10 100k thermistors. It wasn't until I received them that I realized they were only rated up to 125 C. But, although I really can't use them for my heated bed or hot end, I still managed to find something useful to use them for. I have heard many different opinions on whether or not a heat sink should be used. Of course we all agree a fan is without question beneficial. So I figured I would put together a little scientific experiment for all of our beneift. :D
I wired up one of the thermistors to T1 and since I am not currently using a heated bed I can use the bed temp readings in Repetier to monitor the temp of my thermistor. I removed a driver and carefully placed the thermistor right under the little PCB, underneath the driver. After letting it settle into the temperature of the driver with no power to it I got my notepad out and got started. FYI before I began I checked the accuracy of the thermistor just in case I got the settings wrong in the firmware, and after comparing it to my hot end temp and a control (me) I verified it to be accurate.
Here is the set up that will be tested.
Arduino Mega/Ramps 1.4
Drv8825 @ 1/16 set to 1.0v
PSU @ 12v
X axis > Nema 23(Rated 2.5a per/phase)
I took readings every 10 minutes for 30 minutes total with a complete cool down period in between each configuration.
*All Temperatures are in Celsius*
No Heatsink (No cooling Fan):
Temp @ 0min - 26
Temp @ 10min - 86
Temp @ 20min - 90
Temp @ 30min - 91.2
Heatsink (No cooling Fan):
Temp @ 0min - 26.9
Temp @ 10min - 85
Temp @ 20min - 91.4
Temp @ 30min - 91.8
No Heatsink (Cooling Fan ON):
Temp @ 0min - 26.3
Temp @ 10min - 58.9
Temp @ 20min - 61.7
Temp @ 30min - 62.5
Heatsink (Cooling Fan ON):
Temp @ 0min - 26.4
Temp @ 10min - 53
Temp @ 20min - 54
Temp @ 30min - 53.5
I plan on expanding on this experiment over the next few days. So, if anyone has any suggestions, questions, or requests please feel free to let me know.