• 4 Posts
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Joined 1 year ago
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Cake day: August 9th, 2023

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  • Here comes the fun part.
    The Biqu B1 has all it’s wires to the hotend via a USB-C cable. All wires from the motherboard goes to a card in the back of the printer, and fom there is a USB-C to a card in the hotend. This card splits up to TH0, CNCFAN, CNCAN1, FAN2 and HE0. Even power to the nozzle heater goes in the USB-C.

    On the old SKR v1.4, the wire labeled DCIN were connected to FAN1 (GND - 12/24v), and FAN0 were connected to FAN0 (2.3 - 12/24v).
    On the new SKR MINI V3 the DCIN wire is connected to FAN1 (12/24v - PC7), and FAN0 wire to FAN0 (12/24v - PC6).
    The wire DCIN is not from PSU, but gives power to the card in the hotend.

    In the printer.cfg all of fan-stuff are commented out, and the only thing is:

    [fan_generic hotend_fan] #use for testing of hotend fan pin: PC7
    pin: PC7
    
    [fan] #part fan pin: PC6
    Pin: PC6
    

    This gives me sliders in Klipper for PC6 and PC7, and I can set FAN1 to 100%.

    This should in (my) theory give power to the card in the hotend. But when i slide FAN0 in Klipper nothing happens with the fans.

    When i disconnect the wires to the nozzle heater from the motherboard i now have about 24 volts on those wires, and this happens without heating the heater.

    The reason for me starting this project was that one day i just got error message when heating the nozzle. First i bought a new heater, thermistor and the block they are mounted in. This did not help. So, now the motherboard is replaced and I’ve added a Raspberry PI with Klipper to the setup, and still no joy.







  • Yeah, it’s a pretty standard setup. The previous owner put a BLTouch on the printer but never got it to work. I’ve had the printer for about 2 weeks and was about to figure this ABL out, but it misses the ABL option in the menu.
    I’m pretty new in the 3D print business and know nothing about flashing, compiling, and all the options you can do. You recommend the SKR MINI 3.0, and i didn’t know i could change the mobo to other than the original SKR V1.4. What are the benefits of changing to the SKR MINI? And, no, I’m not in the US. But I’ll find it here in Norway…
    And Klipper? Not heard of that either, but a fast youtube peek tells me that this too might be interesting…













  • Thanks for answering. Found a post on Reddit about getting the BLTouch working on stock firmware, it all went well until the printer stated that “unknown command m851”… I’ve looked at the firmwares on Bigtreetech’s GitHub, but I found it just confusing. The newest I found there is older than mine. After all youtube videos I’ve watched and all reading i have done, none have mentioned that the offset parameter is just set in machine parameters and not ABL. Thanks for this.