Kind help on req Duet3d hardware based on specification
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@coolice2020 IMO, closed loop steppers on a 3D printer area complete waste of time and money. Mainly because any positional errors are almost always due to mechanical defects such as belts stretching or slipping, pulleys slipping on shafts, "flexing" of components or any number of other factors. That is to say, positional errors are almost always caused by some sort of a disconnect between the motor and the print head and very rarely caused by missed steps or positional errors of the motor itself. The only way a closed loop system would be of benefit is by using separate linear encoders to measure the actual position of the print head, and feed that signal back to motor driver.
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@deckingman said in Kind help on req Duet3d hardware based on specification:
@coolice2020 IMO, closed loop steppers on a 3D printer area complete waste of time and money. Mainly because any positional errors are almost always due to mechanical defects such as belts stretching or slipping, pulleys slipping on shafts, "flexing" of components or any number of other factors. That is to say, positional errors are almost always caused by some sort of a disconnect between the motor and the print head and very rarely caused by missed steps or positional errors of the motor itself. The only way a closed loop system would be of benefit is by using separate linear encoders to measure the actual position of the print head, and feed that signal back to motor driver.
Thank you for the heads-up understood!
This leaves me with 2 stepper motors as mentioned above or at least one without those problematic protocols. So, the question left: if that one i suitable or not for Duet 3 to control.
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non of the motors you posted are bipolar drive.
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Understood! So, on one side, I check if they have any bipolar stepper motor, which still has these features.
On the other hand, could you recommend me please:
- high-end stepper motor with similar feature set you can recommend ?
OR
- high-end stepper motor and the add-ons required for Duet 3 to have these features within the Duet 3 board itself?
OR
- a controller board can handle these drives ? (dont shoot me pls, I am in love with Duet 3 just trying to understand all options I have) ?
Many Many many thanks!
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@coolice2020 said in Kind help on req Duet3d hardware based on specification:
high-end stepper
i dont understand what you mean by high end steppers.
there are high quality stepper motors
for example moons have got some good reviews
https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-user-mods-octoprint-enclosures-nozzles-.../stepper-motor-upgrades-to-eliminate-vfa-s-vertical-fine-artifacts/Can you specify your requirements for the stepper. what holding torque do you need etc.
the duet 2 can handle external stepper drivers. or like i said you have to wait for the duet 3 to support them as well.
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Based on Veti advise I finally decided on the E3D online stepper motors able to andled by the Duet 3 directly.
I will have 24V instead of 12V setup.
I will have a much moderate meanwell psu.
Replaced the BL touch with Duet IR probe for auto levelling.
Based on Tony advise, I am on research for the thermal fuse for the heated bed.
I will use Pi to take all networking processing stress away from Duet 3, (but keep using Web control), an dthe usb cam will attached to that too.
I reworked the water cooling for being push-pull with 4 large 800rpm fans, able to andled by the Duet 3 directly.BIG thanks for all your patience and help, truly appreciated, keep you posted how the build went or in case I ran into any trouble/question !
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Hi Again,
I am working hard to put together a final wiring diagram to be confirmed, but I ran into some questions, allow me kindly to ask them.
(I always try to search the forum and the docwiki before I ask, but if I am confused, better to be safe than sorry)
Background:
- The Keenovo heatbed I had chosen has built in thermistor.
- I had chosen a proper SSR.
- I had found the wiring diagram for the Duet 3 6HC + SSR + Heatbed as well as the mainboard wiring digramm as well.
Question:
- If I understood well, Duet 3 6HC use the thermistor value to know the actual temperature of the bed.
- But do I need a separate thermostat attached to Duet 3 to control, or thats will be handled by Duet 3 natively, OR I need a TEMP DAUGHTERBOARD OR .. ?
Many thanks for your time and help!
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most of the time the thermistors on those keenovo are B3950 Thermistor.
those can be connected directly to the duet3 -
@Veti said in Kind help on req Duet3d hardware based on specification:
B3950 Thermistor
As far as I see, it has: NTC 100K thermistor buil-in. This one works also ?
And back to my main question, no additional HRDW needed to control the temperature, so not only read it, but control it as well ?
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a B3950 Thermistor is a specific NTC 100K thermistor.
for ssr control please read
https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater#Section_Bed_heater_driven_using_a_Solid_State_Relay -
@Veti Big thanks, and I did read the SSR article you pointed to me already, I even have the SSR wiring diagram, so allow me to rephrase myself:
Having only a built-in thermistor and a properly applied SSR, is enough for Duet 3 to control on/of and specific celsius temperature, right ?
(So basically all not needed watts will be "burned" at SSR, simple is that if I understand well the concept behind)
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a ssr will turn the power on or off as needed. like a switch. if the switch is off no power flows.
the thermistor reads the temperature.as long as the temperature is below the requests temperature the duet will let the power flow.
if its above the requested temperature , the power is turned off. -
@Veti SUPER CLEAR!!!!!!!!!!!!!!!!!!!!!!!!!!
I will add a fuse too, just as suggested in docwiki.
Big thank you !!!!!
(PS: i mark this for solved now, until i have new question. )
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May I ask an other quick question:
I am planning to use 2pcs (since dual head) of Duet3D magnetic filament monitor.
Questions:
- Did I understood right, that this will work with ALL filament (even PVA or transparent) ?
- Did I understood right, that BOTh can be attached directly to Duet 3 6HC without the need of any daughterboard or other extension ?
- Do you truly recommend this? (I am asking this, as its very hard to buy, so would be great to know if this worth it or you recommend something else ?
Many many thanks for your time and help!!
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i dont use filament runout sensors. i prefer to use my eyes.
someone else might be able to comment.
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@ Veti
Truly ? I see. In my case it can happen e.g. overnight, so I would love to make sure, that he printing paused, while I refill the filament.
Hoping may others can respond, especially on the technical prospective, whether the 2 filament sensor can be attached directly to the Duet 3 6hc, right ? I am asking this, because after reviewing this 2 docwiki source, it still not fully clear:
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_filament-out_sensors
https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_RotatingMagnetVersion
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@coolice2020 said in Kind help on req Duet3d hardware based on specification:
Truly ? I see. In my case it can happen e.g. overnight, so I would love to make sure, that he printing paused, while I refill the filament.
the slicer will generate the amount of filament required in grams.
you can then weight the spool to see if there is enough filament on the spool before the print. -
Yes you can attach several filament monitors to a 6HC. In RRF 3.2beta3, filament monitors attached to tool and expansion boards are supported too.
Please note, in all cases the filament monitor must be connected to the same board as the corresponding extruder drive motor. This is so that the firmware can correlate the commanded extrusion with the measured extrusion in real time.
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 -
Fair point, however, when you dont want to have many spools with a small bit of filament left, without a sensor, you are unable to use a complete spool 100%, at least in my experience.
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i use the small leftovers, when i print smaller parts
