SZD-21-2B "Kobuz 3" Q&A

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This topic contains 29 replies, has 13 voices, and was last updated by Avatar davidfj1100 2 weeks, 4 days ago.

Viewing 15 posts - 1 through 15 (of 30 total)
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  • #37471
    Avatar
    Markus Desel
    Moderator

    Hey, I´m the creator of the Kobuz 3 model.
    Pls let me know if there are any issues or questions regarding this design. I´ll try to answer as soon as possible.

    Greetings, Markus

    #37503
    Avatar
    martin.benes
    Participant

    Hello Markus,
    Thank you for this design, I was waiting for glider like this one is. If possible, I would like to know weight of some fuselage and wing parts – I need to setup extrusion multiplier properly. This design is a little different, so old experience with multiplier will not be accurate I suppose. Standard 1.02 value is too much for my printer, I expect it will be 0.88-0.94.
    Thanks for your help

    #37505
    Avatar
    Markus Desel
    Moderator

    Thank you for the interest, I’m not sure if I have single wing parts left, so I might have to reprint one. I will let you know as soon as I get home.

    #37523
    Avatar
    Markus Desel
    Moderator

    I weighted some parts I found. Every part weights about 10% less than shown by Simplify3D using the available Factory files, e.g. “W1” weights 170gramms and Simplify3D shows 190gramms.
    I can create a spreadsheet for you, in case you don´t have access to Simplify3D.
    Pls let me know if there are still any questions, I´ll be happy to help

    #37534
    Avatar
    martin.benes
    Participant

    Thank you very much Markus, especially for your fast reaction.
    To know real weight of W1 part is very useful for me. I also use S3D, so I can use S3D calculation for second weight check. I’ll test it tomorrow and give info about suitable multiplier for Prusa I3 MK3.
    I cannot rule out that I will have another questions, but unfortunately now I have to finish the roof at the cottage and after I will have more time for the models…

    #37544
    Avatar
    thomasc5
    Participant

    I just finish LW1 and it weighed in at 188 grams and took 14h 1 min on a Prusa Mk3 with the standard Gcode. Now onto RW1. oops better change the spool.

    #37549
    Avatar
    seblevcam1
    Participant

    hi,very nice design o)
    are there test pieces somewhere to download?
    thank you

    #37566
    Avatar
    martin.benes
    Participant

    Hi, I tested 0.89 extrusion multiplier on left W1. Final weight is 166g on my MK3 with Plasty Mladec transparent PLA. The part seems to be very strong and reliable. I’ll use this multiplier for printing rest of plane.

    #37586
    Avatar
    thomasc5
    Participant

    Hi Markus,
    I am hunting down the parts for the Kobus and I noticed that you specified 1250 mm of 16×14 carbon tube. Does this need to be in one length and where is it used?
    Thanks
    Tom

    #37588
    Avatar
    Markus Desel
    Moderator

    Hi Thomas,
    The 2 larger carbontubes are used as the wing spar and should be in one piece. If you can’t find any in that length, you could combine 2 by putting a 14mm diameter tube inside the others and glueing them together. I bought the ones I used here: https://www.r-g.de

    Cheers,
    Markus

    #37623
    Avatar
    Markus Desel
    Moderator

    I uploaded some test files in case you want to check your printer compatibility ( https://www.dropbox.com/s/15d25j0l8bzs1iq/Test%20files%20Kobuz3.rar?dl=0 ).
    I also Uploaded additional footage with better quality ( https://youtu.be/gr_0nK03snQ ).

    Greetings,
    Markus

    #37625
    Avatar
    Ralf Wunder
    Participant

    Hello Markus,
    can you give us the recommended weights for the two parts in the dropbox?

    Kind regards
    Beste Grüße
    Ralf

    #37626
    Avatar
    Markus Desel
    Moderator

    Hi Ralf,
    The weight of the parts I printed are always about 10% lighter than the estimated weight by Simplify3D.
    For the test parts I weighted W1=170gramms and F7=96gramms.
    My parts have always been lighter than the weights given by 3DLabprint for their original planes, meaning its probably no problem if they´re a little bit heavier than mine.

    Grüße,
    Markus.

    #51514
    Avatar
    seblevcam1
    Participant

    thank you markus for the parts
    seb

    #51532
    Avatar
    thomasc5
    Participant

    Hi Markus…which parts are printed in black. Its a bit hard to tell from the drawings. Red bits are a bit more obvious.

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