Fused Deposition Modeling or Fused Filament Fabrication, one of the most well known additive technology. This technology is based on heating ,till plastification, solidified polymer material called filament. Then machine put the plastified material on the heated bed in a form of paths. The paths together creates a layer, layer by layer creates in the end whole 3D printed part.
Stereolithography apparatus, method favored by jewellers, dentists and board games hobbysts. Method that gives high quality prints. Bases on solidifing liquid resin in with use of UV light. The UV light can come from laser or projector, depending on the machine used.
Selective laser sintering, method that bases on sintering powdered material, in most cases nylon or polyamid, with use of laser.
Our group assigment in this week was to test the design rules for 3D printing.
One of the inspiration that we had were design rules supplied by 3D Hubs company.
As said before we used the rules from 3D Hubs as insporation and recommended for new users, during work with the printers we have developed some of ours rules for design for our machines. These are individual things that is different to each printer and user. Something that comes with experience gained in time.
Furthermore we have supplied some additional rules for 3D printing settings that can help new users to imagine how the print will look like basing on the setting set in slicing software.
This is a main board that contains use rules of the 3D printing workshop, how to proceed before/during/after using the machine and settings samples for slicing software.
This board show how each layer setting looks like.
This board show how each infill type looks like.
This board show how each procantages of infill looks like and what is the difference between them in printing time.
Second individual assigment for this week was to 3D scan any object. For this I decided to use a hand 3D scanner available in our Lab. It is an Sense 3D.
I decided to scan a handle, for my mother kitchen tool, which got broken and I was asked by my mother more than a year ago to reprint it.
Before I can scan it I need to fix to somehow so it can be exhibited and accessable from every angle for proper scaning.
This is the moment when creativity comes handy :)
Unfortunately the outcome from this scanner was very bad. I have tried looking for some tips on the internet. I have covered the part with ducktape to make it more visible for the scanner but unfortunately it did not worked too well as well.
Here is a video showing how was the examplary output.
After failing few times I decided to drop this method and device and use a photogrametry method. I learned how to use this method from this article: https://blog.prusaprinters.org/pl/photogrammetry2-3dscanningsimplerbetterthanever_32353/
This article bases on using a Meshroom software with AliceVision workflow.
The base of photogrametry are photos. I have to make many many photos of the piece I wish to "scan" and from as many different angles as possible.
To make it easier I had to think of some "device" that would allow me to do that. So again working far from FabLab makes me use all of my in-home creativity skills. So this is what comes out of it:
The piece in placed on wood screw that is screw into a piece of wood which is placed on a rotating wooden plate , that is normally used for cakes. Wooden plate is rotated by me by hand and the camera is set for contantly shooting mode.
I took my Cannon 700D camera for this job. I made around 250 photos. Now I need to load everthing into the software.
After loading the photos all is to do is to press green "Start" button at the top and the computing process will start.
After hour of computing 246 photos I finally had some output in form of cloud of points and overlapsed photos.
The white points with rectangles are POV of one photo and predicted position of the camera. In the middle we can see the cloud of points that form a promitive visualisation of the model.
Close-up on the cloud of points.
After this there is a long computing process for dense mesh and textures so I left the software running over night.
In the morning I recieved the output as following:
The results are not super high quality but I am still happy with them.