Controlling a Cetus3D with Duet3D 0.8.5



  • Thanks for the info, this provides a great starting point once I get the Duet in (still need to order it).
    Right now the printer is still too busy to take it out, but like you, I'm trying to stay close to the original Cetus initially, although I foresee switching to an E3D Titan Aero at a later stage as well, along with 0.9deg steppers, and a heated bed.
    Once again, thanks!



  • @fotomas Thanks a lot for helpful infos. I’m getting Cetus MK3, which should arrive next month, and joined Cetus Duet club 🙂

    How you connect Cetus powerbrick to Duet? Any modification needed?

    Cookie



  • @cookie
    I took a DC jack from an old DELL laptop docking station. 3D Printed a holder so I could screw it down to the Cetus bottom plate using an already existing hole.

    The Cetus bottom plate has four holes for the original controller board. Two of them fits the Duet 0.8.5 board as is. The 3D printed part for the DC jack reaches in underneath the the Duet offering support.

    0_1548331981973_DELL_DC_Jack_holder.png.jpg



  • @fotomas great! Any photo of this dc jack? So I can google it and try to get one.



  • @cookie
    I de-soldered one like in the pic below. But an Ebay or google search for "DC Jack female 7.4 mm" give you some other options.

    0_1548363693613_s-l1600.jpg



  • Hi,

    Another Cetus MK3 owner here. Just got my Duet Wifi, but of course don't want to start pulling cables and boards out of a working printer before I know I have everything and it's reasonably likely to work.

    I think I'm going to need at least a different power supply (not a problem, I'll bring over a bench supply tomorrow). But is that probably it?

    I'd also be super grateful if someone in the know, could post the high level overview of the process? I mean like what are the chapter titles; then I can go off and bang my head against figuring out the finer details of all that until it works..

    Thanks 😓
    Dan



  • dsmudger

    I would say these are major steps

    • Homing switches (I use a microswitch for X and an old dc42 IR sensor for Z and Y)
    • Make adapters or get new cables to stepper motors
    • Make adapter or new cable for hot end
    • Power supply (I am using the original Cetus power supply)
    • Configure the Duet3d (steps/mm and heater values you can see above, the rest I think may vary in your case)

    Original connectors can be forced into the Duet board, but I ended up making adapters both for the steppers and the hot end. Pictures below show before the adapters during "proof of concept phase". On the hotend it self I made a new board using experimental circuit board and matching connectors. There was too much interference in the ribbon cable for the signal from the IR board so I added an ethernet (twisted pair) cable for that.

    If there are any questions I would be happy to help.

    1_1551951790794_20181118_155341.jpg 0_1551951790794_20181118_155206.jpg
    0_1551952241000_20190217_171807.jpg



  • Thanks a lot, that's beyond useful.

    • Cetus MK3 already has 3x homing switches, so sounds like I might even already have all I need.
    • Adapters seems the right way to go so it's easily reversible, but eh, 'ain't gonna need it 🤞'.
    • Duet 2 Wifi came with a little bag of JST connectors; if I'm lucky, the metal crimp terminals might be the same. If so I'll just need to change the plastic shells over (while carefully counting on my fingers which colour goes to which pin). If I'm extra lucky and Cetus doesn't change their wiring too often, maybe it'll even match your photos and help confirm I'm on the right track 👍

    Big thanks again for that, I'll try to post something once I get things going 😀



  • @dsmudger I just got my MK3 running and the Duet Wifi is laying around. Seem like I’ve to figure out the right crimping tools or learn how to crimp without them. I’m so novice when come to wiring works. Will keep you update when there is progress.

    Thanks 🙂



  • @dsmudger

    re adapter: https://www.thingiverse.com/thing:3465278 is what i did for what may be the same "problem" 🙂

    And JST XH terminals which Tiertime use aren't compatible with the molex picoblade, you will need to replace terminals, or as I did, buy male JST XH and make adapters just to make it reversible.



  • @fotomas said in Controlling a Cetus3D with Duet3D 0.8.5:

    On the hotend it self I made a new board using experimental circuit board and matching connectors.
    0_1551951790794_20181118_155206.jpg

    Hello, @fotomas

    I'm working on MK3. The X,Y,Z motors and endstops are working as it should now. But when come to 16 pin connector wiring to hotend's motor, heater, thermistor and fan .. how you figured out which is which?

    Thanks,
    Cookie



  • Dear @cookie 🙂

    That is quite easy.

    Just measure the connections between the Control board end and the daughter board that has separate connections for each "thing". Thermistor, stepper motor, fan, heater. If I remember correctly the hearer uses double wires for both + and -, most likely to increase the cable area.
    0_1553179364491_20190321_063349.jpg



  • They used the same layout on my Up Mini 2. Doubling the heater wires to increase current carrying capability of both wires and connectors. From your picture they use the same pinout as well.



  • @fotomas thanks!

    I spend a few hours figured out, I’m a novice when come to electronic. I tried mapping out the circuit board and use thermistor to check each pair connectivity, then could identified them all 🙂

    Then, Cetus use PT100 as thermistor. Did you swap out to something else or buy PT100 daugther board?

    Also, you get new heater or not? And did you splice the wire for double heating pin, right? Still not sure how to do it right ..



  • @cookie

    I'm using the original cetus thermistor. It works well after finding the correct values for it.

    I do not think a negative B value is common.
    M305 P1 R4700 T112 B-425 C7.060000e-8


  • administrators

    @fotomas said in Controlling a Cetus3D with Duet3D 0.8.5:

    @cookie

    I'm using the original cetus thermistor. It works well after finding the correct values for it.

    I do not think a negative B value is common.
    M305 P1 R4700 T112 B-425 C7.060000e-8

    Looks like you are using a PT100 but you have connected it directly to the thermistor input. This will give you a very poor resolution and you should use the PT100 daughter board instead. However, if you want to use a direct connection then I suggest this:

    M305 P1 X501 R47000

    This says you are using a PT1000 sensor, but inflates the series resistor value by a factor of 10 to compensate for the fact that you are actually using a PT100.



  • Hi guys great thread!

    I have a couple of questions -

    Why do you think they shipped the cetus with 38 ohm steppers? Is there some reason to use high resistance motors?

    Is there any advantage to the mark 3 if you're just going to rip out the electronics?

    Thanks



  • Hello 🙂
    I'm also replacing the main board of my Cetus MK1 with a Duet Maestro.

    I'd like to run both the mainboard and the original heatbed with the original 19V PSU that came with the Cetus. The original main board did limit the current or voltage of the heatbed somehow to not overburden the small PSU. It is that way limited to around 60 °C. For 100 °C it has a connector for an external PSU with more power. As I'm fine with that temperature I want to ask you if it is possible with the Maestro to limit the current or voltage for the heatbed as well? I don't want to destroy my PSU or risk the print to fail due to an underpowered Maestro where the current is sucked away by the heated bed.

    If it is not possible, what PSU dimension do you recommend for the Cetus? I wonder if the MeanWell HLG-320H-24A is big enough, even for 100°C later on?



  • @ted said in Controlling a Cetus3D with Duet3D 0.8.5:

    As I'm fine with that temperature I want to ask you if it is possible with the Maestro to limit the current or voltage for the heatbed as well?

    It is only possible to limit the average power, by means of controlling the maximum duty cycle of the PWM signal for the bed.

    https://duet3d.dozuki.com/Wiki/Gcode#Section_M303_Run_heater_tuning
    https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters

    P parameter in M303 and S paramterer in M307



  • if you get an external mosfet for the hotbed its easy to use 2 power supplies. You can even use different voltages that way.


 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.