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Type: Posts; User: jamcultur

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  1. Replies
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    Twisted box - new version

    As desired by curious aardvark, here's a new version of my twisted box. The previous version was made by twisting two identically-shaped pieces together. This version has different top and bottom...
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    Small objects can be printed directly on the...

    Small objects can be printed directly on the platform of a resin printer, big pieces cannot. If you expose the first layer for a shorter time, it can detach during printing and ruin the print. FDM...
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    The things in the video looked flat without...

    The things in the video looked flat without overhangs. Any of them could be made by 3D printing with with either a resin printer or an FDM printer. To print large flat pieces on a resin printer, you...
  4. Thread: Twisted box

    by jamcultur
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    15
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    779

    Yeah, I used to be able to import and modify STLs...

    Yeah, I used to be able to import and modify STLs in OpenSCAD, but it doesn't seem to work anymore. It is very frustrating. In any case, the code I uploaded to this forum is a simplified excerpt of...
  5. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    The issue was about where to put modules, not...

    The issue was about where to put modules, not about when to create them. You do have to create modules before you reference them, but you don't have to put them at the beginning of your source code....
  6. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    When I first started to code in 1974, the...

    When I first started to code in 1974, the primitive compilers that I used then required you to put modules first so that the compiler would see them before seeing any reference to them. As compilers...
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    Here's a time-lapse video of the University of...

    Here's a time-lapse video of the University of Maine's boat being printed:
    https://www.youtube.com/watch?v=34F71XqvOjg
  8. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    Here's a code snippet with a base and cylinder....

    Here's a code snippet with a base and cylinder. It's kludgy and not exactly what I did to design this box, but it should give you the idea.
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    Last year, a team at the University of Maine 3D...

    Last year, a team at the University of Maine 3D printed a boat that is 7.62 meters long and weighs 2.2 tons. It got 3 Guinness World Records, the largest 3D printed solid part, the largest 3D printed...
  10. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    I printed these at 0.16 layer height using Qidi...

    I printed these at 0.16 layer height using Qidi Print's defaults for all parameters except Z seam, which I specified to be inside to make the outside smoother. Z seams are ugly on shiny filaments....
  11. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    Thank you. I used OpenSCAD.

    Thank you. I used OpenSCAD.
  12. Thread: Twisted box

    by jamcultur
    Replies
    15
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    779

    Twisted box

    Two identically-shaped pieces twist together to form each of these boxes. I uploaded the STL file to Thingiverse in case anyone else wants to print it. The exterior dimensions are 74mm wide by 85mm...
  13. One other thought, ripples in the first layer are...

    One other thought, ripples in the first layer are often caused by the nozzle being too close to the build plate. One way to compensate for this is by specifying Z Offset = 0.1 (under the Advanced tab...
  14. Do you hear clicking from the extruder when this...

    Do you hear clicking from the extruder when this happens? It could be a clogged nozzle or some other source of friction in the filament path. Also, the layer height you mentioned, 0.3 mm, is too...
  15. It does take some work to get resin prints to...

    It does take some work to get resin prints to look as clear as glass. That might be worth it if you are making small quantities. If you want to make larger quantities, injection molding would be a...
  16. Have you asked Qidi tech support? They are very...

    Have you asked Qidi tech support? They are very responsive.
  17. Do you need transparent parts, or would...

    Do you need transparent parts, or would translucent be good enough? It's hard to get truly transparent parts by 3D printing. It's easier with a resin printer than a filament printer. There are many...
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    That doesn't look like the infill pattern. It...

    That doesn't look like the infill pattern. It looks more like underextrusion. It might help to know what kind of printer, what kind of filament, print temperature, etc.
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    I'm interested to hear what people have to say...

    I'm interested to hear what people have to say about this. I don't own a resin printer yet, but I've used a Form 2, which is an SLA printer. The print quality is amazing, but it is expensive. The...
  20. The sand used for sand casting is quite different...

    The sand used for sand casting is quite different from ordinary sand. The grain size is much much smaller, and the better types (like Petrobond) have an oily coating that prevent molten metal from...
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    It's probably not the filament. PLA doesn't go...

    It's probably not the filament. PLA doesn't go bad that quickly.
  22. Cool technique. Casting sand like Delft Clay or...

    Cool technique. Casting sand like Delft Clay or Petrobond would probably work for this. Casting sand is extremely fine and can take very high temperatures.
  23. The Stratasys Uprint SE is an excellent printer....

    The Stratasys Uprint SE is an excellent printer. The build volume is a bit small by today's standards, but print quality is superb. I believe that it can only print ABS. The Stratasys support...
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    It extrudes plastic using big nozzles (8mm -...

    It extrudes plastic using big nozzles (8mm - 20mm) which makes the prints look a little like clay prints made with big nozzles. The YouTube videos were made while the printer was under construction....
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    Huge multi-color CoreXY printer

    A 1800mm x 2500mm x 1500mm CoreXY printer is under development by grad students in Germany. It uses pellets rather than filament, and can print multiple colors. They have some videos of the...
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