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This thread is intended to be a collection of tips and tricks for using MeshMixer with the Form 1+. Meshmixer is developed by Ryan Schmidt at Autodesk, and is available as free download from meshmixer.com
Drag the to red handle to the points on the outer and inner surface where you want the ends of the tube to be. You can play around with the settings to adjust how the tube is routed, but I usually trust the autorouter.
This is often caused by complex models made up of multiple overlapping shells with no wall thickness. Thats is a nice way of saying the types of model often found in the game design, architectural visualization, and visual effects worlds.
I'm trying to automate the 'overhangs generation' for 3Dprinting, with a given STL and meshmixer software, I'm currently able to use 'test.py' successfully with a previously opened meshmixer, it properly cuts the bunny model, (source: -api)
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This is part 2 of of how to create a multi color 3d object/ file for FDM printing. In the first part I highlighted how to use Fusion 360 to create multi color files. In this article I will highlight how to use a free program called Meshmixer (www.meshmixer.com) to take a single .stl file and break it down into multi colors (individual .stl files) for multi color printing !
As you can see, snoopy (found this on thingiverse.com) is a rather boring monochromatic color. If we create snoopy within blender or another application like Fusion 360 we can define the areas that will be a different color and save them as individual objects. However, as with most 3d objects you find, they are created as a single .stl or .obj file and as such can only be printed as single color.
Another thing to consider before I go through the process of defining multiple complex areas within a single 3d object, you need to consider that the color is itself a surface differential, Ie: the infill is NOT colorized, only the shell is defined as a different color. One caveat to this is that when designing multi color files, it is often a good idea to define the color difference beyond the shell itself. For example, in the case of snoopy, if I define his eyes as black and his body white, it is a good idea to extend the color change in the eyes into the infill. Why ? First a shell can be somewhat transluscent, so a 2 shell perimeter may not be opaque enough. Second you get better adhesion with a deeper transition.
Within meshmixer click on the Select Icon. You can adjust the size of the tool. As you can see in the picture you need to select the area as cleanly as you can (although you dont have to precise). Make sure you select all around the object (which means you need to go under the nose etc). PRO TIP: Holding down shift key will delete your selection to clean up.
Once you are happy, Select Modify, Optimize Boundary. This will attempt to smooth/ identify where the boundary is between the two areas/ objects. This is a mathematical calculation.
Meshmixer is a prototype design tool based on high-resolution dynamic triangle meshes. We are exploring the new capabilities of this surface representation for interactive design and fabrication, in the context of a practical system we release to the public. For more information about the project, visit the meshmixer website.
I am trying to install MeshMixer 2.7 from their new linux download page. It was originally packaged for 14.04 but I'm running 14.10. When I run the .deb, it complains that it is missing the libsuperlu3 package. It seems it became libsuperlu4 with the 14.10 release.
I haven't found a ppa with libsuperlu3 built for Utopic. Can I get the libsuperlu3 debs from the Trusty repo and try install them? Or is there a way I can tweak the MeshMixer .deb to reference libsuperlu4 instead?
Here is my tested solution that will work on any ubuntu (or debian) distro. This will download meshmixer 2.9 and dependencies, install it on a opt/ dir on your $HOME and create a meshmixer bin to run it. Doesn't need root access to install or run
Once you load your 3D model, the next step is manipulating the model so that you can either continue to work on it effectively and make it 3D print ready or if minimal editing is required then you can simply rotate to optimise for 3D printing and export (Step 10).
Remember when 3D printing, not crucially but ideally you want two things: Firstly, you want the object to sit flat on the build plate if possible, secondly you want minimum overhangs. An overhang is an area of a model where there is limited support underneath. Anything up to and including a 45 degree angled overhang is printable, however the more you increase this angle, the poorer the finish. You want to orientate the model in a way that overhangs are minimised. Select Edit and Transform. For rotation, simply pick one of the coloured curves (blue, green and red) to transform around that particular axis. Using transform, you can also translate along an axis and thus increase the size in one particular direction. This is done by clicking and dragging the squares at the end of each coloured arrow. Once you are happy with your transformation, click accept to save the changes.
Resizing or scaling your model is usually necessary and if not it is always good to at least confirm your model size before 3D printing. This is easily achieved by selecting Analysis on the left toolbar and then selecting Units/Dimensions. You can alter the dimension along any axis and this will automatically scale your model accordingly. Once you are happy with the dimensions click Done.
The ability to reduce the file size of your 3D model is extremely useful, particularly if your model is a high quality scan as these can often be over 100MB. A 3D file is generally made up of a series of triangles. The greater this number of triangles the more detailed the model and this means a larger file size. In the case of a high quality 3D scan, reducing the number of triangles fairly substantially will not have a huge effect on the overall quality of your 3D print. To reduce, choose Select and then click on the area of the model you wish to reduce. If you wish to reduce the whole model then double click on the model and this will select the entirety. Once selected, choose Edit and Reduce and use the percentage slider. As an example. If a model is made up of 10,000 triangles and you slide to 80% then you will be left with a 2,000 triangle model.
This is a useful tool for trimming parts of your model in any direction you wish. Perhaps there is an area of the model that you want to be completely level or just certain parts that you want to get rid of completely. Select Edit and Plane Cut. You can change the angle of the cut using the coloured curves and the positioning using the arrows. The large blue arrow allows you to select which area either side of the cut you wish to remove. Once you are happy with the positioning of the cut simply click accept.
Your model must be watertight for 3D printing, however occasionally you may encounter a hole or gap in your 3D model. Luckily, meshmixer can help. Select Analysis>Inspector to investigate if your model has any holes. You will be presented with spheres that indicate where the holes are located. There are 3 modes for filling holes: minimal (minimal number of polygons), flat (self-explanatory) or smooth fill (uses surrounding surfaces to create a smooth appearance). You can select different fills for different holes by selecting your preferred fill method and then clicking the sphere you wish to fill using this method, before moving on to another area of the model.
The ability to accurately measure every aspect of your 3D model can be very useful. For example, you may wish to understand how changing the overall scale of the model has an effect on various individual aspects. For producing prototypes and mechanical parts this tool is essential. Select Analysis>Measure and by varying the type and direction you are able to accurately measure any part of the outer shell of your model.
In Meshmixer you are able to split up a 3D model in to multiple slices. This can be very useful if you have a large model that requires 3D printing as separate components. Alternatively you may simply wish to split your model up so that you can better analyse or study distinct separate areas of your 3D model. Start by selecting Edit>Make Slices. There are two methods you can pick: Stacked or Stacked3D. Stacked 3D incorporates the overall form of your model and is generally the preferred choice. You can choose the direction you wish to create slices in i.e. X, Y or Z and finally select the thickness of each slice. Select compute and you will be shown how your model will be sliced up. Once happy, choose accept and your model will be successfully split into separate STL files.
For example, if you wish to provide your model with thicker supports you can click Support Generator and increase the post diameter. Some tweaking may be necessary however this tool is very user friendly. To preview your settings select Generate Support and if you wish to revert to tweak something else simply select Remove Support. Once you are happy click Done.
We hope the above steps prove useful in your 3D printing venture. These steps are just a small sample of what meshmixer is capable of and in actual fact there is a vast assortment of extremely useful tools, not only for simple editing but also for sculpting and producing your very own unique 3D designs.
Are you an educator looking to bring 3D printing into the classroom? Autodesk (creators of Meshmixer) are also creators of Tinkercad and Fusion 360 and we have a whole lesson plan library based on these software packages to help you out. Start a FREE 7 day trial here.
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