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View Full Version : For Sale 3D Print Files Design Tips for FDM Printers 1



kathyhacks
03-25-2015, 03:20 AM
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The past two years has seen a lot of low-cost desktop 3D printers, which are mostly based on FDM, such as the most well-known Makerbot, Ultimaker, Reprap and more others. The requirements on 3D print files may differ a lot depending on the type and the processing method of the 3D printer. In this article we’ll focus on how to design the 3D software specifically for FDM machines, in addition to some precautions.

Source: http://www.elecfreaks.com/8015.html

1. The 3D design models must be the same size up and down, or large lower part and small upper part structure.

As we all know about the principle of 3D printing – or “additive manufacturing, AM, additive processes are used, in which successive layers of material are laid down under computer control.” (quoted from wikipedia) , so if the lower part is smaller than the upper, the top will easily collapse down due to a lack of support. Thus, if this occurs, it will impact the printing results, or eventually leads to failure. Let’s look at an example.

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It’s the former ELF motor mount. The red part in the circle is exactly the above mentioned flawed structure which is easy to collapse. When you finish printing such a thing, you’ll find that the surface is unexpectedly rough. Since the base is firmly glued to the hotbed, with the layers’ weight laid on it, it’s very easy to fall down and break. Though the average success rate remains 70% or less.

2. If the model has to be “large upper par and small lower part”, you need to remember the “45-degree” rule or try to adopt arc structure.

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Change the structure where the curves drop sharply as the above image shows, into a 45-degree angle. This will help improve the print quality. Likewise, using the arc structure will help avoid collapse as much as possible.

3. Try to design a flat base. It is crucial because it eliminates the trouble of the later removal of the support, saving filaments.


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The bottom surface of the arc cannot be printed directly, except that you increase the base and support. After printing, you have to spend much energy to wipe off the base to only find that the finished very rough in shape.

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This is the finished print after initial grinding, hard to accept though. The image below shows the 3D print file for the ELF VRdrone battery case. (Access on MakerbotThingivese (http://www.thingiverse.com/thing:721744))

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It is the print without any post processing.

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To read 3D Print Files Design Tips for FDM Printers 2, please visit here (http://www.elecfreaks.com/8027.html).

3darchitech01
06-13-2017, 03:34 AM
Good information you shared. Explanation in deeply with images and points that wonderful. Good design tips for FDM printers. Thank you for sharing this wonderful knowledge.

http://www.3d-architectural-rendering.com