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aaronalai

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Posts posted by aaronalai

    Fix 3D object for printing

    in Design for Additive Manufacturing

    Posted

    Did you try your Fix Horrible settings? I know if I have a small hole Extensive Stitching tries to fill it up, it may potentially try to fill that small gap between your two pieces. Even if it did though, it doesn't look like there would be a very stable mate between the two larger pieces; or maybe it just looks that way.

     

    Why doesn't the UM2 ship with Loctite or similar product applied?

    in Coffee corner

    Posted

    There's another problem with Loctite: The usual stuff (242 as well as 243 I believe) simply doesn't work with stainless steel (according to the datasheet it should reach 25% strength after a considerable amount of time). It won't harden even after 12 hours of curing time because it just doesn't cure around passive materials such as stainless steel.

     

     

    Dipping bolts in loctite is easy, dipping the setscrews however, is a different task. As you suddenly have to put in loctite and insert the setscrew while the pulley is already in the machine, which is significant more difficult.

     

    Very good points, it looks like the torque wrench is the way to go; it's nice to know the UM team has something up their sleeve.

     

    UM2 extrusion rates revisited

    in Improve your 3D prints

    Posted

    Thanks for the details! It would be interesting to see if others can reproduce the same results. Just making sure, but the x-axis is temp and the y-axis is mm/s right? Also, illuminarti, your calibration cup is a really great idea. I'm going to be revisiting these posts when I get my UM2, they seem like fantastic reference points to test for a well calibrated machine.

     

    Has anyone here printed a Tantillus?

    in What have you made

    Posted

    Thanks for the advice! I appreciate all the pictures, I think there needs to be some official troubleshooting guide or video or something for the UM2; it seems like there are still a few common issues.

    I got my bearings the other day and just need the printer now :-P.

    Also, I read the assembly guide for the Tantillus and am even more interested in it now.

     

    Why doesn't the UM2 ship with Loctite or similar product applied?

    in Coffee corner

    Posted

    In professional assembling one usually avoids using loctite due to the time it takes to apply it. It means additional assembly time which results in a higher price of the product.

     

    I agree, but I've seen people simply just dip the bolt into blue loctite and then insert; you don't need much. The extra step adds a few seconds which at most would accumulate to a couple of minutes of additional built time in an ideal situation. I thinks it's kind of a grey area as to whether or not it is financially worth it in the long run to deal with the few who have problems as a function of loose bolts and set screws or to add a few extra minutes to each build.

     

    They are really expensive. We looked into that when we noticed there where problems with the pulleys going lose. But price wise it's not feasible.

    I think they are using torque wrenches now to assemble the machines, as tests show that properly screwed down pulleys hold as well as the ones with loctite. And we're looking into slightly different pulleys that have less problems with vibrations.

     

    Great to hear; will you keep us posted on this? I think something to address the loose bolts and set screws would prevent a lot of minor issues. Also could you potentially provide the torque settings for maintenance?

     

    Has anyone here printed a Tantillus?

    in What have you made

    Posted

    Hey Chrisp, I've been following the other 10 page thread with Nicolinux's stuff and I see many different ways to remove clogs, I suppose it's contingent upon the severity of the clog. I am wondering for your common clogs, like when switching to orange PLA what method do you use? Is it the one where you cool the print head to something like 90C and yank the filament out of the bowden tube? Great thread BTW!

     

    Great 3D scans

    in Improve your 3D prints

    Posted

    This is pretty cool, I didn't know sites like this existed; the price doesn't seem unreasonable considering the investment it would take to get good digitization of larger things like a person. We have a ROMER coordinate measure machines at work with a freakin laser scanner head, when it's not being used for experimentation I'm totally going to scan away, anyway that thing was something like 100k. Also, it takes a while to render the digitizations and do some touch-ups so I suppose you are also paying for someone else's time. Thanks for the post.

     

    The crossflow fan approach

    in Third party products & modifications

    Posted

    @Aaron

    Exactly! If I would have to design a printer I would start with your idea. It's the most straightforward approach to provide an optimum thermal situation.

    printer-schematics.jpg

     

    Has anyone rotated their printer 180 degrees so the device is upside down? I can see a few problems with this like bridging creating hanging bits that would hit the printer head. I ask because in some regards I think this would be the easiest way to retain the heat in the printer in the correct areas of the printer. Keeping cool air at the "bottom" of the printer separated from the hot air at the "top" as a function of the differences in their densities. Probably not worth the hassle though, but an interesting thought.

     

    The crossflow fan approach

    in Third party products & modifications

    Posted

    @foehnstrum, I'm glad you think the idea is worth a second look! I was thinking about it in the shower, which is were all my best ideas have been born.

    @gadgetfreak nice find, I'm looking forward to the android version. Although my UM2 hasn't shipped, I'm still interested in implementing something like this for it. Although I am definitely interested in how well it performs out of the box without any modifications. I melted my old K-thermal probe for my multimeter in an old project, and ordered this bad boy as a replacement http://www.amazon.com/gp/product/B0084JQL1Q/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 with a really long probe http://www.amazon.com/gp/product/B00D8337YW/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1 I figured this should help me take accurate point readings throughout the inside of the UM2 while making simultaneous comparisons to the outside.

    I also snagged myself a small crossflow fan for testing purposes, this one measures about 1.75 inches thick and 5 inches long in its current housing; but the internals are all removable and I think I can redesign a more slim case if I can't squeeze it into the UM2 as is. Just got to wait until that printer ships!

     

    Small bug in Cura when changing "print all at once" and "one at a time"

    in UltiMaker Cura

    Posted

    Hello, I was playing around with the newest version of Cura 14.01 (downloaded today), and noticed that when I switch from "print all at once" to "print one at a time" or vice versa the layers view does not update to reflect these changes. I'm not sure if the printer will go ahead and print the way you selected or print via what the layers view is describing, as I don't have my printer yet and have no way of testing it :smile:

     

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