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Anyone on BFB extruders?


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Posted · Anyone on BFB extruders?

Hello Guys

Do i Make something obvious wrong?

Im having a Ultimaker. Electronics are completely from Makerbot: Mega2560 with Motherboard v2.4, 4 Stepperdrivers v3.3, extrusion controller board v3.6(intact)

However i want a BFB Hotend to work in my machine.

now the machine connects as Thingomatic with Stepstruder MK7, Motherboard and Toolhead firmware is 3,1…

I can let the stepping motors move. now however the Toolhead does simply nothing.

Although all temperatures still set to 0 in the control Panel, im getting a read of 1023,0 sometimes 1024,0 C degrees. Heatbuildplattform works just fine...

The BFB Hotend got a 200k Thermistor in it.. more info is not available cause the guys at BFB are not that friendly. They dont want to be part of the Openscource.

For testing I tried an original 100k Makerbot thermistor attached on t+t-. which sadly doesnt change temp reads to correct values...

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    Posted · Anyone on BFB extruders?

    you have to solder in a resistor on the ultimaker pcb, very close to the temperature connectors. IIRC 4.7k, but look at the eagle files. Its basically a resistor divider network. Also, you need to change the configuration of your firmware.

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    Posted · Anyone on BFB extruders?

    Honestly it would probably be easier to try to change the thermistor out for a thermocouple. Do you have a thermocouple with those electronics?

    Also you might get more info from the Makerbot google group and MB forum.

    -b

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    Posted · Anyone on BFB extruders?

    Got it solved!

    i got makerbots thermocouple now and first i wasnt shure where to hang it to the extruderboard as it had 3 lines coming from the thermocoupleboard...

    later i found the thermocouple works just fine without its board. i just connected it to the thermistor +- and got correct readings of 20°C roomtemp.

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    Posted · Anyone on BFB extruders?
    This is for all those people who have old screw extruders that BfB sold,

    Yes I had one of those. I think every single acrylic trapped nut part broke off. And I fried my motor controller trying to push abs through it. Then the bearing holders broke. Acrylic is not a good material for extruders!

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