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Over-extrusion problem after converting to 1.75mm filaments.


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Posted · Over-extrusion problem after converting to 1.75mm filaments.

Hi everybody!

A year ago I decided to convert my Ultimaker 2 into 2+.

I've seen that you could buy from 3D Solex an Olsson kit that used 1.75mm filaments.

So I decided to convert my Ultimaker 2 with the 3D Solex Olsson kit and also buy the feeder kit from Bondtech for 1.75mm filaments so I do not have any problem.

Unfortunately, for a year, every time I print I have problems with overextrusion.

I modified the firmware using the one developed by Tinkergnome and I am forced to modify the flow of material by reducing the flow from 100% to 68% when the print is vertical while I have to increase it to 75% when mold horizontal parts all if I use the ' 0.6 mm nozzle.

If instead I use the 0.4mm nozzle things change again I need to increase the flow values.

All this without being able to get perfect prints as it was before the conversion.

It's been a year since I'm going to make changes to the flow but I always have a lot of extrusion, a flow of material that comes out.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    In some cases, without changing the flow, I have the acceptable vertical print portion even though it always has a bit of over-extrusion and then the horizontal parts in under-extrusion.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    Do you use the default temperatures for the 0.4mm and 0.6mm nozzle or did you change those values in the firmware?

     

    I've changed, I've tried different temperatures from 206 to 210 degrees Celsius.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    Have you tried calibrating the extruder to see how much your outing out

     

    No, I did not even try because I did not know how to do it.

    How do I do this calibration?

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    Do you use the default temperatures for the 0.4mm and 0.6mm nozzle or did you change those values in the firmware?

    I've changed, I've tried different temperatures from 206 to 210 degrees Celsius.

    That's not too much. You may vary temperature a bit more, but don't go over 230°C for PLA.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    I don't say this is your problem but it would not hurt to check what your system is doing, personally I would check.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    Hi to all !

    Hi paul9 !

    Have you tried calibrating the extruder to see how much your outing out

    I think bob-hepple is right,

    Independently of the material diameter use,

    The extruder Estep calibration was the first thing to do, it's easy to do if you use the Tinkergnome firmware. ( hightly recommanded)

    If use the UM2+ Extruder , here the process

    With the rotary button, clic on Tinker control board

    Advanced

    Preference

    Motion settings

    Axis steps mm

    clic on E "nnn.nn" the value indicated (note this)

    clic on it to change it by this new value : 341.62

    do not forget to clic on "Store" before go back

    Done !

    This will be a good average base, (may be it will need to adjust a bit if use the Tom's guide process for sample)

    Here the math formula

    Esteps/mm = (Nr.motor steps rev * Nr.driver micro steps) * (Nr.big gear teeth / Nr.small gear teeth) / (effective grooved gear diameter * PI)

    Extruder UM2+ - Nema 17-200-16 and 36T/11T reduction gears

    Deep groove gear diameter 9.75mm

    (200*16) * (36/11) / (9.75*3.1416) = 341.62

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    I don't say this is your problem but it would not hurt to check what your system is doing, personally I would check.

    Thank you Bob!

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    Hi to all !

    Hi paul9 !

    Have you tried calibrating the extruder to see how much your outing out

    I think  bob-hepple is right,

    Independently of the material diameter use,

    The extruder Estep calibration was the first thing to do, it's easy to do if you use the Tinkergnome firmware. ( hightly recommanded)

    If use the UM2+ Extruder , here the process

    With the rotary button, clic on Tinker control board

    Advanced

    Preference

    Motion settings

    Axis steps mm

    clic on E "nnn.nn"  the value indicated (note this)

    clic on it to change it by this new value :  341.62

    do not forget to clic on "Store"  before go back

    Done !

    This will be a good average base, (may be it will need to adjust a bit if use the Tom's guide process for sample)

    Here the math formula

    Esteps/mm = (Nr.motor steps rev * Nr.driver micro steps) * (Nr.big gear teeth / Nr.small gear teeth) / (effective grooved gear diameter * PI)

    Extruder UM2+   -     Nema 17-200-16 and 36T/11T reduction gears

    Deep groove gear diameter  9.75mm

    (200*16) * (36/11) / (9.75*3.1416) = 341.62

    Thank you Gudo,

    But I understand after some considerations that actually the problem is not overextrusion but cooling. I can not immediately cool the material while printing and create an effect that seems to be over extrusion.

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    Posted · Over-extrusion problem after converting to 1.75mm filaments.

    funduct.thumb.jpg.efea7a2231999925b856f80500a4653c.jpg

    I'm looking for a good solution for the conduct of the fans.

    Does any of you know where I can find this kind of fan duct?

    I saw a video on youtube but I could not find the STL file.

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