Design guide for 3d printing

Guidelines, formats and useful tips for the design of your files

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Usable formats
  • 3MF (3D Manufacturing Format)
  • STL (Standard Triangle Language / Standard Tassellation Language)
  • OBJ (Object)
  • VRML2.0 (Virtual reality modeling language)
  • STEP / STP (Standard For The Exchange of Product Data)

We will take into consideration only and exclusively files of these formats, which must contain a SINGLE part, (in the case of two parts that will be assembled therefore, you will have to send two files, one for each part) with the exception of Cages or Multi-parts.

Print unit dimensions and tolerances

Nylon PA12

  • Dimensions: 380x284x380
  • Tolerance: ± 0.3mm, ± 0.3% for dimensions> 100mm

The tolerances shown are to be understood as valid for measurements carried out both on the entire part and on partial areas of it such as thicknesses, holes, pins, center distances, etc.

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Thickness and thin walls dimension

The MJF printing technique guarantees quality even to thinner parts or walls, taking into account, however, that their thickness must at least be greater than 1 mm, and requires at least 2 mm to also ensure impermeability to the walls.

Niuo thin wall thickness dimensions

In the event of any walls less than this thickness (this also applies to the other parameters that we will see later, such as holes, grooves, etc.) the file may be rejected or may not guarantee the integrity of the parts, which is the responsibility of the customer or even better than the file designer, follow these guidelines for job compliance.

Game and Graft Limits

The parts to be engaged, coupled and / or intersected will need at least 1mm of play.

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Groove recommendations

As for the grooves, a minimum spacing between the parts of 1 mm is recommended, always taking into account the proportions with the height of the walls.

Groove recommendations

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Specific on very dense parts, thin parts and large walls

Completely full, dense or very thin parts are prone to thermoplastic deformation.

As for the long and thin parts, it is recommended to divide them, where possible, into several sections.

In the case of a very dense part, it is suggested to completely empty the interior or create a latex structure to reduce weight and volume, while maintaining the same mechanical properties.

Lattice commander model

Eg Lattice commander

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Material discharge in large hollow parts

In large hollow parts, the design of two holes of ≥ 10mm diameter is recommended to ensure dust escape.

Niuo Image Large empty parts

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Cavities, channels and coils

As for the cleaning of the material in small spaces such as cavities, channels, coils or simple holes, a diameter of at least 1mm is recommended. If the depth is more than three times the diameter, the total cleaning of the hole or cavity will not be guaranteed. We also suggest adding through holes rather than blind holes, to facilitate the cleaning operation.

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Result optimization of texts and logos

The thicknesses of texts and logos (engraved or in relief), to ensure that they are visible, must have a minimum size of 2mm.

Result optimizations of texts and logos

It is the responsibility of the customer or even better of the designer of the file, to follow these guidelines for compliance and the success of the work.

Multi-part cages

In order to load a file containing multi-parts, of the same or different small dimensions, it is possible to create a containment cage at least 1 mm thick, where the pieces must be at least 2/3 mm apart internally.

The cage must have sufficient spacing between the walls to allow the best possible cleaning, taking into account however that the smallest part does not come out inside.

Your project will be sent to you inside the cage and for these reasons the total cleaning of the parts inside it is not guaranteed, without adequate control of the quality of the individual pieces and the lack of possibility of any colors.

Multi-part cages

E’ responsabilità del cliente o ancor meglio del progettista del file, attenersi a queste indicazioni per la conformità e la riuscita del lavoro.

Holes and threads

3D printing does not allow us to process standard threads, so we propose below
different types of holes to make them in post-processing:

  • Draw the hole with the diameter dimensions as per ISO standards, in order to go to
    then make the threading with suitable tools.
    We recommend that you draw the hole smaller than ± 0.2mm in relation to the diameter, so as to
    compensate for any printing tolerance of ± 0.3mm, so as to be able to resume the hole with
    a drill bit.
  • Draw the already threaded hole on the 3D model, and then you can resume it with a suitable tool for threading following the trace of the printed thread, this method is especially recommended for threads with dimensions starting from M5-M6. Also in this case it is advisable to keep a negative tolerance of at least 0.1mm on the drawing with respect to the ISO dimensions.
  • Finally, a further solution can be to exploit solution 1) to create a suitable seat where you can insert Helicoil type inserts; the service is not offered by us but only recommended among the possible solutions.

 

E’ responsabilità del cliente o ancor meglio del progettista del file, attenersi a queste indicazioni per la conformità e la riuscita del lavoro.

Do you need to have a confirmation on your file to be eligible?

You can have it checked by our 3D printing experts

If you have doubts about the file you have performed and you need a specific check of the parts, you can have it checked by one of our experts (Check your file € 5), who will check specifically all the points covered in the guideline:

  • Thickness size
  • Games and grafts
  • Grooves
  • Thin walls, thicknesses and very dense parts
  • Material discharge in the empty parts
  • Channels, cavities, coils and holes
  • Texts and logos
  • Cages and multi-parts

Having examined your part, we will be able to send you, if you do not respect at least one of these points, the ideal way to make it happen, by correcting or modifying the file.

In the event that your file passes the Check, you will be given the ok to continue with the payment and complete the order.

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