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  2. 3D Print Design Guide

Design guidelines for 3D printing

Few and simple rules to design the best and get the most out of your 3D design

1. ACCEPTED FILES FORMAT

  • stl, 3mf, step, stp, other formats need a conversion
  • Only files with SINGLE parts are accepted, except chained parts (read chapter 4) and caged Multiparts (read chapter 9)


 

2. MATERIALS, MAXIMUM DIMENSIONS, MACHINES, GENERIC TOLERANCES, and INFIL

  • Printed with HP 5210 MJF

    • Nylon PA12
      • Dimensions: 380x284x380 mm (15×11.2×15 in)

      • Tolerances: ± 0.3mm, ± 0.3% for dimensions >100mm
      • Infill: 100%
    • Nylon PA11

      • Dimensions: 380x284x380 mm (15×11.2×15 in)

      • Tolerances: ± 0.5mm, ± 0.5% for dimensions >100mm
      • Infill: 100%
    • Polypropylene PP

      • Dimensions: 250x250x250 mm (9.8×9.8×9.8 in)

      • Tolerances: ± 0.6mm, ± 0.6% for dimensions >100mm

      • Infill: 100%
    • Nylon PA12 Glass Beads 40%
      • Dimensions: 380x284x380 mm (15×11.2×15 in)
      • Tolerances: ± 0.4mm, ± 0.4% for dimensions >100mm
      • Infill: 100%
  • Printed with LED MSLA +4KSPER™

    • Resin  ABS-Like

      • Dimensions: 250x152x390 mm (9.8×5.9×15.3 in)

      • Tolerances: ± 0.2mm, ± 0.25% for dimensions >100mm
      • Infill: 100%
  • Printed with FDM (Metal Replacement)

    • Nylon Extreme™ Carbon Fiber +PA12 (Carbon Fiber Filled 30%)
      • Dimensions: 300x300x600 mm (11.8×11.8×23.6 in)
      • Tolerances: from ± 0.6mm, ± 0.75% for dimensions >100mm
      • Infill: 30%

    • Extreme™ Peek
      • Dimensions: 300x300x400mm (11.8x11.8x11.8 in)
      • Tolerances: ± 0,6mm,  ± 0,75% for dimensions > 100mm
      • Infill: 30%
    • ABS for food
      • Dimensions: 300x300x600 mm (11.8×11.8×23.6 in)
      • Tolerances: from ± 0.6mm, ± 0.75% for dimensions >100mm
      • Infill: 30%
    • ABS for medical
      • Dimensions: 300x300x600 mm (11.8×11.8×23.6 in)
      • Tolerances: from ± 0.6mm, ± 0.75% for dimensions >100mm
      • Infill: 30%

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

Any Extrablack (classic or semigloss) finish will not increase final dimensions of the parts, being made by dyeing process.

Any RAL painting or painting chosen from the available Finishes will lead to a dimensional increase in the thickness in the following values:

  • Glossy paints: + 90-100 microns
  • Matt paints: + 70-80 microns
  • Metallic paints (gold and silver): + 90-100 microns
  • Soft Touch paints: + 180-200 microns


 

3. MINIMUM THICKNESS AND THIN WALLS

MJF and MSLA technologies can handle very thin walls, but to be sure you are receiving pieces of adequate quality, the walls must be at least 1mm thick, while for the FDM technology we suggest at least 3mm.
Any walls below this minimum size can also lead to the rejection of the file during the validation process.

A minimum thickness of 1mm is also required to ensure the impermeability of the walls (only for molded parts in MJF) although we suggest a thickness of 2mm, MSLA and FDM technologies do not guarantee waterproofness.

Compliance with this feature is the customer's responsibility or the designer of the file, we can not, therefore, guarantee the integrity of these areas even if the part has passed validation.

To help you in this check we provide a dedicated button at the top right of the 3D preview of the file just uploaded, it is still in Beta version and does not have 100% reliability

The areas highlighted in red show any critical thicknesses identified:

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Do you want your file to be verified by an Expert?

If you want us to check your file in order to guarantee the effective success of your print, all you have to do is activate this option once you have uploaded your file.

We will take care of all the necessary checks, click here to find out more.

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Do you want to proceed in any case despite minimum thicknesses not respected, assuming the risk?

To do this, all you have to do is check this option, as shown in the example below:

allegatoS3 (1)



 

4. MATING CONNECTIONS

Parts with mating connections need a 1 mm gap between every wall.

We only accept single part files, if not chained together.

This possibility is not allowed for MSLA printing technology.

(Compliance with this feature is the customer's responsibility or the designer of the file, we can not, therefore, guarantee the functionality of these areas even if the part has passed the validation.)



 

5. HOLES, CANALS, CAVITIES, COILS, AND UNDERCUTS

The 3D printing technologies supplied by us, such as MJF, FDM, and MSLA, do not allow a total cleaning of these areas when they do not provide sufficient access for this process, the risk is that they are occluded by printing dust or resin, not guaranteeing the desired passage.

The minimum diameter or opening is 1 mm, and in the case of a depth greater than 3 times the diameter, cleaning cannot be guaranteed.

For blind holes, we suggest you add service holes to remove construction dust, through holes instead of blind holes can facilitate this operation.

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(Compliance with this feature is the responsibility of the customer, i.e. the designer of the file, therefore we cannot guarantee the cleanliness of these areas even if the part has passed the validation.)



 

6. TEXT, LOGOS and EMBOSSED FEATURES

To get the best results we suggest keeping the elements of these features at least 2 mm in height or thickness, on FDM technology, a bas-relief or hollow solution is preferable to create writings and logos.

Compliance with this feature is the customer's responsibility or the designer of the file, we can not, therefore, guarantee the integrity of these areas even if the part has passed validation.



 

7. SLOTS

A 1 mm gap between walls is required, proportional to the height of the walls, while for FDM at least 2mm.

(Compliance with this feature is the responsibility of the customer, i.e. the designer of the file, therefore we cannot guarantee the cleanliness of these areas even if the part has passed the validation.)



 

8. EMPTY / HOLLOW PARTS

In the case of hollow or empty parts, at least 2 holes of 8 mm in diameter must be drawn to allow construction material to be discharged

(Compliance with this feature is the responsibility of the customer, i.e. the designer of the file, therefore we cannot guarantee the cleanliness of these areas even if the part has passed the validation.)



9. MULTI-PART FILES

Do you want to upload a single file containing multiple parts in order to save on the minimum price?

You can upload a multi-part file containing parts, the same or different and of small dimensions, as long as these have a containment cage around them, as suggested in the green boxes, in this way they will not be lost or broken during cleaning operations.

Any multi-part files that only have connections between them (red box) will no longer be accepted in order to avoid loss.

The containment cage must have a thickness of at least 1mm and a sufficient spacing not to allow the smaller component to escape inside.

Also, make sure to adequately space the parts between them and the cage with at least 2-3 mm.

8-3

The parts will be supplied in the cage itself as per drawing and are subject to the rules presented on this page.

It will not be possible to guarantee, for obvious reasons, adequate cleaning, quality control, and any painting among the available Finishes.

This solution is only suitable for MJF parts with a size of up to 35x35x35mm each



 

10. BIG PLANAR PARTS - THIN PLANAR PARTS – HIGH-DENSITY PARTS - WARPAGE RISK

We strongly suggest not to draw thin and extended parts such as an A5 sheet or higher (both flat and freeform parts), because due to the thermal tensions developed during the production process, thermoplastic deformations can easily occur, the part will therefore be curved or twisted.

This can also happen for parts with a huge thickness or density (> 3cm) with at least one of its sizes extended for more than 15cm

For parts with these characteristics we, therefore, suggest creating the opposite area to the visible one in a lightened way, almost totally emptying the otherwise full-thickness, leaving a reticular reinforcement structure, honeycomb or ribs or ribs (monodirectional or crossed), as shown in the image below.

By doing so, this type of problem is partially reduced, while at the same time giving greater flexibility and lightness to the part as well as an obvious cost saving due to the reduction of the actual printed volume.

Supports and ribs cannot always help or solve these problems:
our suggestion, if you cannot accept the slightest deformation, is to completely avoid parts of this type.



 

11. POLYPROPYLENE (PP) Ratio between volume and total surface

The Ratio between these 2 values (Volume/Surface) cannot be over 4,5 times, if so the result of the print would be unstable and not predictable.

We suggest emptying the otherwise full-thickness more dense areas, leaving a reticular reinforcement structure, honeycomb, or ribs, as shown in the image below.

111

Do you want your file to be verified by an Expert?

If you want us to check your file in order to guarantee the effective success of your print, all you have to do is activate this option once you have uploaded your file.

We will take care of all the necessary checks, click here to find out more.

3-Dec-05-2020-09-51-26-13-AM