Help choose: Maestro vs WiFi
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Should I switch to thermistor as they are cheaper and don't need expansion board? (Do not plan to go higher than 300C)
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@briskspirit said in Help choose: Maestro vs WiFi:
Should I switch to thermistor as they are cheaper and don't need expansion board? (Do not plan to go higher than 300C)
IMO, thermistors work fine. You print at the temperature which works best for you and which varies from filament to filament. So even if the thermistor was (say) 5 degrees off, and reads 200 when the true temperature is 195, it doesn't matter - you just print at 200. In reality, I swapped from some unreliable PT 100s (the wires kept breaking) to thermistors and didn't have to alter my print temperatures.
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Any opinion about this PT100? https://www.ebay.com/itm/1m-Ultimaker2-PT100-Thermocouple-Control-Header-Thermistor-Sensor-for-3D-Printer/253239234320?hash=item3af63c0f10:g:zhYAAOSwk-1Z-omB
I saw recommendations about connecting 2 or 4 Wire PT100, but not about 3 Wire
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@briskspirit you can always use it as a 2 wire sensor, just leave the reference wire disconnected or just connect the two red wires together. Anyway it will only be accurate as a 2-wire sensor.
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@falkia Thanks, understood
Need to make a decision:
1 - Now I have two Thermocouples K - $30 for expansion board
2 - Or switch to PT100 - $30 board + ~$20 sensors
3 - Switch to thermistors - less than $10 but need to change heater blocks -
@briskspirit or look into PT1000 sensors which are better than thermistors but not quite as good as PT100's but they don't need the daughter boards to function
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@dougal1957 Why are they better?
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@briskspirit the accuracy is better than a thermistor and they tend to have known response curves which are the same for most if not all of them you have no need to worry about B values or temp/resistance curves PT100's are flat response PT1000 are nearly flat certainly close enough to flat for us not to seriously worry about it. I have 100's on my delta but will probably use 1000's on my next CoreXY Build
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@dougal1957 trying to find 3mm PT1000 on eBay and Amazon - zero...
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PT1000 sensor cartridges
You can also get the bare sensor for around 1.5-2$ each from places like RS in the UK and there most be places all round that have them get some 3mm od stainless tube and make your own -
@dougal1957 So with so small difference in price between PT100 and PT1000 the point is to save some money on expansion board, right? Is it ok to use connectors with this type of sensor?
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@briskspirit yes indeed it is ok a std 2 pin molex KK is what I have tested with on my Duet Ethernet board for my bed sensor using one of these discreet sensors works very well and take all the pain of configuring the Thermistor resistance-temp table (Beta value). the response on a RTD (PT100/PT1000) is pretty much linear.
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And PT100 2-wire can't be used with connectors? And 4-wire can be?
