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mr.-waldorf

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    CoMeDoONE for Ultimaker2

    in Third party products & modifications

    Posted

    Hey guys, before I go jabbering on again I just wanted to say I view this thread as a casual conversation with ya'll, and that I'm not trying to spam it with ideas or cause confusion. I hope you view it likewise :D. We have meetings at work where we try to figure stuff out and all types of ideas are thrown around, I think it really helps to see things from many different points of view.

     

    I consider your comments as a casual conversation, we just discuss possible scenarios and possible culprits. This is very usefull, please keep the "jabbering".

     

     

    Has anyone downloaded the datasheet for the precision resistors gr5 posted?

    I thought the Derating Curve on page two of the resistor datasheet was interesting. If the ambient temp get's above 70C the rated power of the resistor plummets; perhaps heating up the resistor and then running 0.078 watts through it is slowly damaging the thing.

    Up to 70C the resistors can facilitate 0.125 watts; with 1.25 Amps going through them at a nominal resistance of 0.05 ohms they are only facilitating 0.0781 watts. But if they are heated up too much and the power rating starts to drop off, perhaps trying to pump 0.078 watts through them is slowly killing them. It's hard to tell from the graph but it looks like at about 80C the resistors are only at 60% their power rating, which would be 0.075 watts.

     

    I downloaded the resistors datasheet and I totally agree with your thoughts and I also agree that increasing the current may worse the problem

    Today I can't make more tests because I have to finish some "homework", but tommorow I will return to the attack

    So Aaron keep the jabbering comming because they are very smart deductions.

     

    Can your UM2 printer achieve 10mm3/s ??? Test it here...

    in UltiMaker 3D printers

    Posted

    ===

    gr5 edit: waldorf lets post summary here:

    no problem: gr5, waldorf, takei,illuminarti

    problem:mostlyAtomicBob, NicoLinux

     

    Good idea George. I Will try to update the summary.

     

    My own UM2 was also much better when I first got it. PLA used to pour from the nozzle at the start of a print leaving a long trail up to the start point. It was fine right up to my first nozzle clog and has been struggling ever since. Now its usually 100mm around the brim before the flow gets going.

     

    Hi Woofysplace, should I add your printer to the problems list? maybe after you check the nozzle?

     

    Can your UM2 printer achieve 10mm3/s ??? Test it here...

    in UltiMaker 3D printers

    Posted · Edited by Guest

    Hi All,

    Some UM2 users are reporting under-extrusion problems, did you already tested your printer extrusion rates? You can download the *extrusion test here and should be printed at 230ºC

    Should be interesting to know if this is a widespread problem or just a few isolated problems

    Please post your results this can help you and others

    Thanks

    ===

    No problem: gr5, Waldorf, Takei, illuminarti, Skint, Shurik, IRobertI (@1.5A), Rabanwin, MostlyAtomicBob(@teflon coupler), braddock(@new bowden tube), CanadaDrones(@friction free spool), Arska, colorfabb(@loosening the 4 screws on the print head), Pikey, Stuart838, Nicolinux(@new printer), Didier_Klein, WoofysPlace (new nozzle), Ju1050, tomkooij, Calimero, ProfePaco

    problem: MostlyAtomicBob, NicoLinux, Woofysplace, IRobertI, braddock, CanadaDrones, Geeks, colofabb, Shafe, Das_ENGINER

    *Many thanks to illuminarti, it was him who made the extrusion test

    illuminarti edit: For context, here's the link to the original posting of the test piece.

    CoMeDoONE for Ultimaker2

    in Third party products & modifications

    Posted

    Second extrusion test at 230ºC and 22,0ºC room temperature with ventilation and without the board cover

    Board temps (measured as close to behind the chip and resistors as possible)

    Start (idle) 22,0ºC

    In the end of heating up process: 26,0ºC

    1º Layer 3mm3/s: 27,5ºC

    1ª layer 4mm3/s: 27,5ºC

    1º layer 5mm3/s: 27,5ºC

    1º layer 6mm3/s: 27,6ºC

    Failed at 6,5mm3/s: 28,1ºC

    Made the test twice and they failed in the same way.

    Tomorow I will check my nozzle for any clogs just to be sure

    I forgot to mention that I am using a half empty spool. It seems that with empty spools it fails at 6,5mm3/s and with a new filament spool sometimes fails at 9,5mm3/s and sometimes can make the 10mm3/s. After checking the nozzle I want to repeat the same tests with a new filament spool and maybe with a litle higher extrusion rate to understand if there is diferences with the board ventilation and this way we can exclude bended filament from the equation.

    Edited: These tests means nothing, I may have permanent damage resistors. It seems to me that the temperature near the extruder stepper is too hot. I can´t complain a lot because I can achieve the 10 mm3/s (after a few changes) and maybe with less bended filament and with board ventilation its possible to reach the 12mm3/s. My real problem here it's just filament bended due to radius of an empty spool. The spool should be changed for a bigger radius to avoid so much bended filament.

    It should be great if others users could do the same tests because is not enough data to take any conclusions. I think that Nico's printer board after being inspected by Ultimaker team, can give some anwsers. (or the stepper motor)

     

    CoMeDoONE for Ultimaker2

    in Third party products & modifications

    Posted

    Hi Aaron,

    I have VERY interesting data. You will be very happy with the first results...

    First extrusion test at 230ºC and 22,0ºC room temperature without ventilation and with the board cover on

    Board temps (measured as close to behind the chip and resistors as possible)

    Start (idle) 22,0ºC

    In the end of heating up process: 37,7ºC

    1º Layer 3mm3/s: 47,0ºC

    1ª layer 4mm3/s: 74,1ºC

    1º layer 5mm3/s: 81,0ºC

    1º layer 6mm3/s: 84,7ºC

    Failed at 6,5mm3/s: 85,1ºC

    There was a very tiny under extrusion at 83.5ºC. The most interesting is that under extrusion occur right after 85ºC (the Absolute Maximum Rate for the chip)

     

    CoMeDoONE for Ultimaker2

    in Third party products & modifications

    Posted

    Oh man, I am so happy...

    Hey Boys very nice job you nailed it. Now everything makes sense and explains a LOT. Actually it explains everything, every behavior that I observed on my printer and in some other printers is in total agreement with your findings.

    I think we have a winner here!! Congratulations!! maybe you didn't notice yet, but I am really excited with it.

    Tomorrow I will try to print some extrusion tests with a fan under the resistors

     

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