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  5. 2 Process 3D Models

2 Process 3D Models

ATTENTION: It is very important, that if you start this Process, that you finish it until the next “SAFE POINT”, which is the end of the Chapter “Gettting the 3D Models”. If at any point you decide not to go on please make sure to delete your progress or mark it as unfinished!

2.1 Before you get the 3D Models

You have to decide what you want to search for.

There are two options:

The model is already in our “Para buscar en 3D”-List The model is not in our “Para buscar en 3D”-List

2.1.1 Option 1: The model is already in our “Buscar”-List

Open Trello -> Modelos 3D Look in the List “Para buscar en 3D” for a object you want to search for Open the card and read the description and what has already been done Continue with the steps to get 3D Models 2.1.2 Option 2: The model is not in our “Buscar”-List

Decide which Model you want to search for Open Trello -> Modelos 3D In the List “Tutorial” open the Card “PLANTILLA MODELOS (COPIAR)” Search for the button “Copy” and click it. Choose a Name e.g. “Panteon Rome” Select List “Para buscar en 3D” Change position to “1” Close the Card Open the new card you created in the List “Para buscar en 3D” Click “Labels” on the right Click on “Show all Labels” Deactivate all Labels that dont correspond your model. The Card needs to have at least one “Epoca” “Tipo” “Tecnic”-Label

2.1.3 The Trello Card

Your Trello Card has following Information:

Name Description: What to search for + Google Drive Link to Models (Default) A Checklist: All this points have to be completed in order for us to see the Model as “finished”. Activity: In this area we document everything we do in the process of finishing the 3D Model.  Members (to the right): Here we can choose who is working on the 3D Model. If you decide to work on it click “Join”. Now everybody knows that you are working on the model and you will get Notifications of changes and comments. Additional: You can add additional information like “Checklists”, “Due Dates” or “Files”

2.2 Getting the 3D models 2.2.1 Downloading the 3D models

The most popular websites to download ready-made 3D models are:

Yeggi

MyMiniFactory – scan the world

Sketchfab

Thingiverse

Google (Search “Name+3D File”)

What for?

There are many websites that already have a lot of 3D models ready to be downloaded. All you need to do is search there whatever you are looking for.

Note: You need to search with english keywords, as it is the most common language on these platforms. Only afterwards try other languages.

How to do it?

Go to the website (start by Yeggi) Search for the keywords of what you are looking for Choose a model that looks good Click on the download button Copy the URL link of that model Paste the link in the dedicated card in Trello

Note: The files usually are downloaded as ZIP folders. Inside, they contain the STL file of the 3D model. This is the file you will need.

2.2.1.1 Licencia Modelo original

In the Link to the original Model find the Licence under which it was published. What for?: Depending on the original licence we also have to adapt our licence.

2.2.2 Making a working folder in Google Drive

What for?

For every 3D model, a new folder will be created on Google Drive. Inside, the subfolder “TMP_Trabajo” is where all the working files are found. These are the files that will be modified on Meshmixer, Blender and PrusaSlicer and eventually sent to 3D printing as tests. The tests will be repeated as many times as necessary, until the optimized settings are found and approved.

Note: There will probably be several versions of files with similar names, so you have to be clear when naming each file. Tell in the filename what you did with it. For example: “Model_decimated_0.3percent_withsupports.stl”

How to do it?

On your PC, go to Google Drive > Mimeticaslab > Modelos 3D > Modelos en Trabajo Copy the template folder “AAA-Archivo-Plantilla” Paste in the same folder and rename as follows: “Epoca_Nombre” (example: Griega_Panteon) Go to your downloads folder Move the STL file from the downloads folder to the newly created folder, and into the subfolder “TMP_Trabajo”

2.1.2 Finishing up (Checklist and advancing Card)

In the Trello Card check:

Carpeta Google Drive hecho 3D File STL Enlace Modelo Original Etiqueta Siglo o Estilo Etiqueta Disciplina

ATTENTION: Check first if you actually fulfilled all of the points.

Move the Card of the 3D Model to the List “Para Revisar/Editar (3D)”

SAFEPOINT

2.3 Editing the 3D models

2.3.1 Decimate filesize with Blender (If File-Size exceeds 10MB)

A lot of files you will find in the internet have too much detail for 3D printing. They can go up to 200MB or more. In order to later upload the files to the repository and save disk space we will have to decimate the detail of the file.

How to do it?

Open Blender Delete Cube Import the Model (.stl, .obj) Select Model (to focus on the model click “.”) Open the Settings-Page with the Wrench Add Modifier (Decimate) Change the Ratio of the Model to between 0.1-0.3 Check the Model, if you can see any difference. If not go lower with the Ratio. To see the original model without the Decimation click the “Screen-Symbol”. Activate/Deactivate it to see the changes Repeat the steps 7-9 until you are statisfied Make sure only the Model is selected Export Model as STL Activate “Selection only” in the export dialog. Export

2.3.2 Making basic edits: inspecting, aligning, scaling

What for?

The 3D models downloaded online will need to be edited in Meshmixer to repair any potential mistakes, choose the size you want, and any other necessary edit. Meshmixer will also be the place to add customized support or slice the model if needed.

Note: For more information, see this 10-step tutorial.

How to do it?

Open Meshmixer Click “Import” Choose the STL file to edit

Inspecting

Go to Analysis > Inspector Keep all the settings as default (Hole Fill Mode: Flat fill; Small Thresh: 0.01mm) Click “Auto Repair All” > “Done”

Note: If there is any problem, write it as a comment in the dedicated card in Trello, and leave the 3D model to be fixed. Do not continue editing.

Aligning

Go to Edit > Align Keep all the settings as default (Source: Base Point; Destination: World Origin / Y-Up; Transformation: Translate and Rotate; Flip unticked) Click “Accept”

Scaling

Go to Analysis > Units/Dimensions Change the X, Y and Z dimensions as necessary Click “Done”

Note: The printer has a print area of ​​250 x 210mm with a height of 210 mm. The maximum size of the largest dimension should be 200mm. The recommended size is 150mm.

Saving

Go to File > Export > Save in corresponding folder “TMP_Trabajo”; File type: STL Go to File > Save as > Save in corresponding folder “TMP_Trabajo”; File type: MIX

2.3.3 Making advanced edits: adding customized support

What for?

Ideally, the 3D model will need to:

Be as flat as possible on the printing bed Have as many little overhangs as possible

Depending on the model, it will require some support.

Note: Making customized support is a time-consuming process, and varies according to the size of the model (it is not scalable). Deciding about customized support will depend on each model’s specific features, whether it requires customized support from the start or whether it can wait until after the first draft is printed.

How to do it?

Step Step Step

2.3.4 Making advanced edits: splitting the model

What for?

Ideally, the 3D model will need to:

Be as flat as possible on the printing bed Have as many little overhangs as possible

Depending on the model, it will require to be split.

Note: Slicing the model will require to later glue the parts together. It is not a desirable option and is used as a last resort when adding customized supports cannot work, or when the size of the 3D model is too big to be done in a single print.

How to do it?

Step Step Step 2.4 Slicing the 3D models in PrusaSlicer

Abrir archivo STL con Prusa Slicer

Seleccione parametrizaciones estándar (arriba a la derecha):

Ajustes de impresión – 0.3mm DRAFT MK3 (sólo para borradores, cambiará más tarde dependiendo del resultado para la impresión final)

Relleno – 10%.

Opcional: si se necesitan soportes normales:

Soportes – En todas partes (+ "ajustar para puentes" cuando aparece)

Modelo de corte (para comprobar si la salida está bien)

Archivo – Guardar Proyecto como – guardar en "TMP Trabajo" (dentro de "Modelos 3D" – "Nombre del modelo" – Carpeta temporal "TMP Trabajo", previamente copiada de AAA-Archivos Plantilla como plantilla en cada nuevo modelo)


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