Help choose: Maestro vs WiFi
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@briskspirit said in Help choose: Maestro vs WiFi:
@dc42 I am using 5 drivers right now (dual extruder setup) and MMU for example needs 3 more
...Can I add two TMC2224 for X an Y on Duet 2 WiFi?
No, the Duet WiFi doesn't have the extra UART for driving TMC2224.
Maestro + expansion board gives you 7 stepper drivers, enough for a quad hot end. Also enough for MMU I would have thought.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 mmm, need to count again. I have 3 axis + 2 extruders right now. So I can add 2 more steppers(and MMU needs 3 as I saw?)
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@briskspirit For what it's worth, my big CoreXYUV sits in a spare bedroom, next to the one my wife and I sleep in. I have the Duet Ethernet plus Duex 5 expansion board and all 10 drivers are fully employed (5 extruders). My moving mass is around 4kgs in the Y direction, and around 2.4kgs in the X direction. I regularly print at 80mm/sec with non-print moves at up to 350mm/sec.
Despite this, with the bedroom door shut, it's barely audible - the loudest noise is from the hot end fan. I've done many many 24hr plus prints whereby the printer has had to run all night and it's never disturbed our sleep, even with just a thin stud and plasterboard wall between our bed and the printer.
So although stealth chop will make it quieter, 256x micro-stepping really isn't too bad. If it was my decision, stealth chop would be very low on my list of priorities.
Edit - unless you plan to have the printer in the same room that you sleep in
2nd Edit. I have two XY gantries - one carries the hot end, the second which sits above, carries the 5 extruders. So that's twice the number of motors running compared to most printers.
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@deckingman Sold!)) Thank you! Ordering Duet WiFi right now
Now I am waiting for an aswer from Qidi regarding which thermo sensors I have there... (They should be Thermocouple K I think, but can’t be sure.. M4 threaded with 2 wires)
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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?
