Showing posts with label cad. Show all posts
Showing posts with label cad. Show all posts

How to convert G-Code back into STL?

I've been researching methods to convert pure G-Code back to STL / .OBJ, and it seems that there are not many options but it can be done.

G-Code Reverser by MakePrintable

Even in its beta version it looks the most developed out solution.

Here is the Reverser description:
The Generated G-Code commands represent horizontal layers “slices” of the 3D model, sliced as the model was placed, scaled, and rotated in the slicing software’s platform, those commands are generated with user and printer-specific settings, all of which makes the G-Code almost impossible to modify in order to retarget different printers, let alone modifying the original model itself.
Our Reverser interprets the G-code, and collects the details and data needed from the commands, then it regenerates the 3D model which represents the outcome of the printing process using the respective G-code file.
This feature allows users to reuse G-code, by regenerating the G-code using the Reverser’s outcome, and simply changing the settings, or even target other printers than the one targeted in the G-code file.
Power users and 3D designers would get the chance to modify the model once more, as the outcome of the Reverser would be in .OBJ or .STL formats, which means they can import it into 3D editing software and start with their editing.




Blender GCode Reader Add-on and GCodeImport
https://github.com/zignig/blender-gcode-reader

http://www.thingiverse.com/thing:6236

New version: https://github.com/iraytrace/BlenderGcodeImport


There are some solutions that enable G-Code visualization and / or printing simulation like but not conversion or export to STL:

GCode2Vtk that displays g-code like VTK 3d model.

https://github.com/pbrier/gcode2vtk

GCode Analyzer/Visualizer
http://www.thingiverse.com/thing:35248

http://gcode.ws/

CNCSimulator can simulate 3d printering out of g-code

http://cncsimulator.com/




Repetier Host seems to be able to simulate g-code in 3d model bu I'm not expert on it.

If you know any other methods to convert g-code back to STL let me know so I can update this post.





















Update:

Could this be used to hack 3d model streaming services? A kind of a workaround?
There are services like Pinshape that use "streaming" as a sort of DRM that enable you to print an object without downloading it in order to preserve the original .stl object and prevent sharing or piracy.
Theoretically you could us a sort of custom Marlin that only reads the g-code and records it and you could use g-code reverser to make an original STL.

Here is an example of streaming service:



Source blog post about streaming function:

http://blog.pinshape.com/the-3d-printing-cloud-based-streaming-has-arrived/?cet=3130

DRM systems always fail and punish only a paying customer.


DIY contact 3D scanner with Arduino and FreeCAD

Here is a nice little 3d scanner made from various scrap parts and Arduino. It is a simple contact 3d scanner that produces a pint cloud in FreeCAD.

It uses only three potentiometers and two steel rods,  and the same potentiometers are also rotational joints. Arduino is sending the current value of the potentiometers to the python script, which calculates the mechanism position and draws the points inside FreeCAD.

This device was developed by Javier Martinez Garcia from Spain.



Here is the video of it in action scanning a toy car:


Project homepage:

http://linuxforanengineer.blogspot.com/2014/12/freecad-mechanical-3d-scanner-using.html

Hopefully Javier will publish the more detailed plans for it.

Great work Javier!

Best Linux distribution for 3D printing?

I researched a bit for a best Linux distribution focused on 3d printing and found CAE Linux. It is loaded with digital fabrication and 3d design software packages.

Here is the description for the project site:
Thanks to Open Source, now you just need to insert the CAELinux LiveDVD in your computer to turn it into a free and open engineering development workstation with CAD, CAM, CAE / FEA / CFD, electronic design and 3D printing features: no licence and even no installation is required !

Based on the open-source CAD/CAM software such as Freecad, LibreCAD, PyCAM and Cura and CAE softwares like Salomé, Code_Aster, Code_Saturne,OpenFOAM and Elmer , you can design your CAD geometry, perform multiphysics simulations to optimize your design, generate G-code for prototyping with 3D printing & milling, and even develop your own PCBs & microcontroller based electronic circuits for automation.  
For example, using Freecad, you can design your parametric CAD geometry with ease, generate a computation mesh and setup your simulation problem in Salome_Meca in a few minutes. After your design is checked you can go on preparing a G-Code for CNC milling a prototype with PyCAM or 3D printing it with Cura.
With the integrated open-source tools of CAELinux, you can simulate incredibly complex physics with the open-source FE & CFD solvers Code_Aster, Code-Saturne, OpenFOAM & Elmer: non-linear thermo-mechanics, coupled fluid-structure dynamics, seismic / non-linear explicit dynamics, contacts, visco-plasticity, fluid dynamics, heat exchange, convection heat transfer and radiation in other words nearly all physics problem can be addressed with the integrated solvers!! Then reload your results files in post-processing applications like Salomé, GMSH or Paraview to visualize your data in 3D... And don't forget all these features are based on open-source / free softwares, so now you don't have to pay for any expensive licenses and if you want, you can even improve it.
SALOME on CAE Linux

Here is a video overview of CAE Linux:



CAE Linux homepage: http://www.caelinux.com/CMS/

There is also good 3d printing support in Fedora 19 distribution.

Hopefully the CAE Linux team will update the distro soon since the last release is in 2013.

Here are series of video tutorials going into more details of the software installed by DrRMFithen. Great guides on how to use open source CAD and 3d design:









Massive collection of animated mechanical movements and devices

While I was looking for a design of an automatic windows opening mechanism that I could use on my workshop I found this little jam on the YouTube.
The channel is just named "thang010146" and contains big number of video animations which show various mechanical movements and internal working mechanics of different devices in many areas like construction, engineering, hydraulics, gears, cams, robotics and many more. There are new videos coming up frequently.
If you are hobbyist, maker, engineer or just curious this is very useful reference base for finding solutions or inspiration.

Here are some examples:







You can find many MANY more mechanism schematics here:

https://www.youtube.com/user/thang010146/videos


One of the windmill / wind generators designs from the channel  


Lin3s simple design tool that works great for compressed air extruders

Lin3s is a simple CAD web tool that enables you to create 3d objects from simle line drawings. It works great for paste extrusion and air pressure extruders. Lin3s is developed by 3digitalscooks crew and they use it in their 3d printed food projects. Great work!

Here is a basic tutorial on how to use Lin3s with main options:




... and here is the result 3d printed with hummus (yes, hummus!) mmmm on nom nom ...



You can use it via web interface here: http://www.3digitalcooks.com/design-tools/lin3s/lin3s.html

...or learn more about it here:

http://3digitalcooks.com/2015/01/lin3s-new-design-tool/

Interface is very simple:

















Free webinar on 3d printing and impossible geometry





Here is a new free webinar presented by Tyler Reid of GoEngineer. It explores the geometry and shape complexity which can be implemented with large design freedom due to additive manufacturing production technology abilities and limitations.
With 3d printing design complexity can be much higher and this webinar goes trough several areas where more intricate geometry can be of value.
Presented areas are: art & character design, consolidated assemblies (like complex valves and nozzles), cellular & lattice structures (in industrial and medical applications) and microscale prints,


Halo figurines as example of character design

You can find more webinars like this one starting here:

http://diy3dprinting.blogspot.com/2014/11/free-webinar-on-3d-printed-car-parts.html

http://diy3dprinting.blogspot.com/2014/08/free-webinar-on-3d-printing-jigs-and.html

... links inside those posts will guide you to more similar content ...

Update:

new webinar on medical aplications: http://diy3dprinting.blogspot.com/2015/02/free-video-webinar-on-3d-printing-in.html




Design and Fabrication by Example software wants to simplify CAD design

CAD design and 3d model development are not the easiest tasks around if you are a beginner. It takes time and learning effort just to get the results you want. I currently struggle with learning the basics, so I found this article about new software developments.
This software is not yet available to the public bu it demonstrates how design can be facilitated by using 3d model "templates" from a database.
"Fab by Example" was developed by MIT  Computer Science and Artificial Intelligence Lab (CSAIL).


From source article:
Even as 3-D printing is poised to help democratize manufacturing, it’s often overlooked that many 3-D-printed items are far too complicated for users to digitally design.
Sure, people can now order 3-D-printed items online, or even make wedding-cake figurines using 3-D-printing services at certain stores. But these are simple, largely standardized products. What if you want a chair or car built to your exact specifications?
Now, a team led by CSAIL researchers has developed “Fab By Example,” the first data-driven method to help people design products, with a growing database of templates that allow users to customize thousands of complex items, such as cabinets, jungle gyms, and go-carts.
“When we design things on a computer, the question arises of how to manufacture them in the real world with the necessary physical parts — wood, glass, screws, hinges, bolts and all,” said project lead Adriana Schulz, a PhD student in CSAIL. “For casual users, creating such a detailed model is not just time-consuming, but it’s actually more or less impossible unless you know something about mechanical engineering.”
Fab By Example’s intuitive drag-and-drop interface lets you mix and match materials — and position, align, and connect the different parts — without worrying if the design is actually feasible.
“The technology allows you to design and fabricate practically any off-the-wall idea that’s bouncing around your head,” Schulz said.
The system, which is not yet available to the public, currently has dozens of distinct template models, each composed of hundreds of parts, down to the individual screws of a go-cart. The models are all “parametric,” meaning that they can be manipulated to take on a nearly infinite number of different shapes. Schulz says that the team’s database of templates is currently meant to be illustrative, and could evolve to include models of cars, houses, or practically any fabricable object.
For a given project, Fab By Example allows you to see what specific parts are needed and how much they cost; you could then order the materials right from the database, with the option to optimize for price or speed-of-delivery. (Currently, you’d still need to assemble the product, but Schulz envisions a future where the database could be tied to an installation service that would send someone to your home to build it.)
Where previous do-it-yourself design databases have required an advanced degree, or at least expertise in computer-assisted design (CAD) software, the team says that now even someone with simple computer skills can make a own customizable item.
The work was developed by Schulz; CSAIL postdocs David I.W. Levin and Pitchaya Sitthi-amorn; Wojciech Matusik, an associate professor of electrical engineering and computer science at MIT; and Ariel Shamir, a professor at the Interdisciplinary Center Herzliya in Israel. The team will be presenting its system at this month’s Siggraph graphics conference.
In the future, Schulz says that the team will be working with CSAIL colleagues to incorporate designs for robots that could be assembled, customized, and even printed from home.

Here is a video of software in action:





... it really looks like it simplifies design process for 3d print or CNC machining , but when will it be released to the public or integrated in other software packages?


More information about the project can be found at:

http://fabbyexample.csail.mit.edu/

PDF paper: http://fabbyexample.csail.mit.edu/fabByExample_preprint.pdf

Source article:  https://www.csail.mit.edu/node/2296

























How to design and CNC cut wooden enclosure for your 3d printer

GuruBrew made an excellent tutorial video with step-by-step instructions on how to design and CNC cut wooden enclosure for your 3d printer. Video is very detailed and will guide you trough the entire process with valuable tips & tricks, software and tools used.

This is what the enclosure looks like:

































The enclosure is made out of .25 an .5 inch MDF wood and acrylic (plexiglass) plastic. It was cut ona Techno CNC router. It is designed in Solid Works and CAM software was VCarve Pro and Mach3. It was made for Maker Farm Prusa i3, but the design could fit or be addapted to most machines.

Here is the video tutorial:





Here is a video of finishing the enclosure with Plexiglas panel windows:




GuruBrew has a great YouTube channel with many useful videos I'm subscribed to and would recommend you to follow him also ...


For other similar DIY wood enclosure projects check this post which features enclosure heated by scraped hair dryer heater:

http://diy3dprinting.blogspot.com/2014/03/diy-3d-printer-enclosure-made-from-wood.html


This style would go great with wood frame 3d printer, which I like since wood has natural and warm feeling.




3DPrintTech is a free CAD plugin for model splitting and nesting for efficient batch printing

3DPrintTech is a free software from India that will enable you to print objects larger than your printvolume by splitting them into smaller modules.

From the homepage:
3DPrintTech is CAD plugin for model splitting and nesting for efficient batch printing. It helps the user to print objects larger than build volume of a 3D printer. App splits the large model in small components as per your printer settings. It also creates the connectors to help you glue the components to make your original large model. User can define various parameters of splitting.
User has an option to scale the model. Also to get separated view of split parts can use Explode.
3DPrintTech has unique feature 3D Nesting. 3D Nesting helps you combine many small components in one single printing process by 3D packing with clearance. This helps you to save time, energy and money.

3DPrintTech also provides the option of Export to save the split parts or nested parts as stl files which can be directly use for printing.
Also user can do all these processes for his/her own customized printer too by adding it to the existing list of printers.
As 3DPrintTech is developed by using Confluence Framework, it supports:
  • AutoCAD 2014
  • Inventor 2014
  • Solidworks 2013
In future versions of 3DPrintTech using Confluence Framework, it will support more CAD softwares like Revit, Rhino, Creo, NX etc.
From the press release:
Pune, India - July 25, 2014 – Centre for Computational Technologies Pvt. Ltd. (CCTech), a CAD and CAM product development company, announced today launch of new application 3DPrintTech for maker community. 3DPrintTech helps maker to build object larger than build volume of any 3D printer. App also provides the functionality to pack small objects in given build volume which help to save time and money to user. 3DPrintTech is currently available for FREE of cost and works as CAD plugin with Autodesk Inventor 2014, AutoCAD 2014 and SolidWorks 2013.
3DPrintTech is designed for maker community who faces challenge to print larger objects on small 3D printer quickly. Processes of converting your design into small parts are time consuming and require good CAD modelling expertise. We realized there has to be a better way for this particular problem. Our R&D team came up with an application that can divide design of large object into small connectable components within few minutes. App also provides user option to control the cylindrical connectors as per his requirement. User can define the connector in terms of radius, length and taper angle. User also control the distance between the connectors, distance between connector and object surface.
Next problem of maker community is packing of multiple components in one print batch. One option for maker is to manually pack as many possible objects within build volume. He has to make sure that packed objects does not intersect or touch each other. To solve this problem, we provide a feature called 3D Packing. It creates the batch of 3DPrintings from collection of many small components. In our benchmarking, we found that for many cases our 3D Packing helped to reduce the 3D Printing batches from 10 to 1. This is definitely going to help makers to print more objects in less time and less money.
3D printing is continuously evolving technology. Therefore app has provided an interface to add your custom printer. App provides many utility functions such as Exporting processed objects to 3D printable STL file, Explode objects for quick inspection, scaling the object for unit conversion or fitting into printer. As 3DPrintTech works within a CAD system so you can do multiple design iterations without leaving the CAD application. All the 3DPrintTech operations are nondestructive and hence keep your design intact.
Sandip Jadhav, (Co-Founder & CEO, CCTech) says “3DPrintTech should help maker to improve productivity by great degree. It will also help maker to push envelope by making new large 3d objects. 3DPrintTech 1.0 was released on Autodesk App exchange in Autodesk University 2013. 3DPrintTech app received the great response and feedback. Out development team incorporated these user suggestions in our final product. App’s ability to create objects larger than the print volume using our automated splitting technique and packing of small components by efficiently nesting is key strength. 3DPrintTech is developed using CAD application development framework known as Confluence Framework. Therefore it works for multiple CAD systems seamlessly. In future we would provide more choices of connectors, packing types and more CAD platforms".
You can download 3DPrintTech software from http://labs.cctech.co.in/3dprinttech. To know more about the 3DPrintTech software & capabilities kindly contact labs@cctech.co.in.

http://labs.cctech.co.in/3dprinttech/



How to create model for 3d printing from CT or MRI data with open source 3D Slicer





This very detailed tutorial was prepared by Nabgha Farhat, Brigham and Women's Hospital. It describes, step-by-step how to extract specific data form CT scan and convert them into format from which it can be 3d printed. She isolated portions of the mandibular bone and the temporal bone for the model. Freee and open-source Slicer software was used.
Data was acquired with:  http://en.wikipedia.org/wiki/Cone_beam_computed_tomography

Tutorial has several chapters:
  1. Introduction to the 3D Slicer interface
  2. Loading data
  3. Volume rendering and cropping
  4. Creating label maps
  5. Creating surface models
  6. Saving data in file formats appropriate for 3D printing
Link to Slicer:

http://slicer.org/

http://wiki.slicer.org/

Slicer is a free, open source software package for visualization and image analysis. 3D Slicer is natively designed to be available on multiple platforms, including Windows, Linux and Mac Os X.




















Luis Ibanez made a post on KitWare blog, describing the process of actually printing this object:

http://www.kitware.com/blog/home/post/591




























For other medical field 3d printing applications see:

http://diy3dprinting.blogspot.com/search/label/medical%20applications%20of%203d%20printing


Source:

https://www.youtube.com/watch?v=MKLWzD0PiIc


BTW: yes, you can 3d print your own skull if you have a CT scan of it ...

Update:

Here is Reddit thread on how to make 3d models from MRI data which has more methods beside this one more specific for MRI and DCIM images:

http://www.reddit.com/r/3Dprinting/comments/247847/i_had_an_mri_and_they_gave_me_the_cd_with_the_mri/


Update 2 (5.10.2014.):

Here is another video tutorial by Oliver Krohn on how to convert DICOM CT or MRI images into 3d printable models. It uses different software tools.
Preparing DICOM images (CT/MRT) for 3d printing using Seg3D, Imagevis3D (University of Utah, CIBC) and Meshmixer. 
Seg3D offers the advantage to apply filters, but it's not absolutely necessary. Imagevis3D can load DICOM stacks as well and the rendered isosurface may be exported as mesh directly. In this video I used the gaussian filter of Seg3D to smooth the model a little bit. 
Software Downloads:
http://www.sci.utah.edu/cibc-software...http://www.sci.utah.edu/cibc-software...http://www.meshmixer.com/download.html





Update:

here is a tutorial on how to design and 3d print a custom trachea stent from CT data:

http://www.instructables.com/id/Create-a-Custom-3D-Printable-Prosthetic-Device-Usi/?ALLSTEPS

Here are some 3d printed prototypes in common plastics from the tutorial above:



Easel CNC web based CAD software for your desktop CNC mill





Presentation of new web based CAD software which would simplify work with desktop CNC machines like Shapeoko. It is still in beta and the website takes mailing list notifications sign-up.

http://www.easelcnc.com/ (domain not working anymore)

new Easel homepage:

http://www.easel.com/

Here is Easel by Inventables:




Overview of easel interface:


























Update:

Here is a tutorial on how to use Easel with raspberry Pi:

http://diy3dprinting.blogspot.com/2014/11/how-to-run-easel-cad-on-raspberry-pi.html


faBrickation 3d printing with volume replaced wth Lego blocks by Hasso Plattner Institute




faBrickation a new approach to rapid prototyping of functional objects, such as the body of a head-mounted display. The key idea is to save 3D printing time by automatically substituting sub-volumes with standard building blocks — in our case Lego bricks.
When making the body for a head-mounted display, for example, getting the optical path right is paramount. Users thus mark the lens mounts as “high-resolution” to indicate that these should later be 3D printed. faBrickator then 3D prints these parts. It also generates instructions that show users how to create everything else from Lego bricks.
If users iterate on the design later, faBrickator offers even greater benefit as it allows re-printing only the elements that changed. We validated our system at the example of three 3D models of functional objects. On average, our system fabricates objects 2.44 times faster than traditional 3D printing while requiring only 14 minutes of manual assembly.
More Information: http://www.hpi.uni-potsdam.de/baudisc...
faBrickation is a research project by
Stefanie Mueller, http://www.stefaniemueller.org 
Tobias Mohr,
Kerstin Guenther,
Johannes Frohnhofen,
Patrick Baudisch, http://www.patrickbaudisch.com
Hasso Plattner Institute, Germany


Update:

here is more detailed video and in.depth live interview done by Make:




Update:

Hass Institute has a new project named WirePrint:

http://diy3dprinting.blogspot.com/2014/09/wireprint-wireframe-3d-printable-models.html


What software should I use when starting 3d design and modelling for desktop manufacturing?

There are many options and variables when choosing the 3d design software that suits your needs when you get into 3d printing.
Here is a useful decision tree chart that will simplify the decision based on price, platform and your personal preferences:

Click on the chart for bigger size version:


























Here is the page dedicated to 3d printing related software and links to it:

http://diy3dprinting.blogspot.com/p/3d-design-and-printing-software.html

Source:

http://realizebxl.be/

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