What is 3D printing?
3D printing is also known as rapid prototyping fabrication or additive manufacturing, it is a prototyping process whereby a real object is created from a 3D design. The digital 3D-model is saved in STL format and then sent to a 3D printer. The 3D printer then print the design layer by layer and form a real object.
What is a 3D printable design or model?
Designs or models are 3D printable when they can be sent directly to a 3D printer. A 3D printer needs files in the industry standard file format STL. Most 3D design software can export to STL. 3D printable designs must be watertight, meaning that the design has only closed solids, and no open surfaces. All planes must have an internal and external thickenss.
What can you make with 3D printing?
In 3D printing area, people say "If You Can Draw It, You Can Make It". Many items can be made with a 3D printer. However complicated objects can only be made by professional 3D printers, they are not yet affortable for common family.
What 3D Printers aren't?
3D printers do not:
What are the materials used to print 3D objects?
Many different materials can be used for 3D printing, such as ABS plastic, PLA, stereolithography (SLA) materials such as Acrylic resins and photopolymers wax.
At Inventadore, we are able to fabricate 3D objects with ABS, PLA, Flexible rubber-like plastic, dissolvable plastic such as HIPS and PVA, and unique to Inventadore only - SLA Lost Wax Casting with material such as Aluminium, Silver, and Gold.
Interested to fabricate your 3D objects in metal? Talk to us and let us help you to realise your idea in metal 3D object.
What are ABS and PLA?
ABS (Acrylonitrile Butadiene Styrene) is a common thermoplastic well known in the injection molding industry. It is used for applications such as LEGO, electronic housings and automotive bumper parts.
PLA (Polylactic Acid) is a biodegradable (under the correct conditions) thermoplastic derived from renewable resources such as corn starch or sugarcane. It is one of the most popular bioplastics, used for many applications ranging from plastic cups to medical implants.
To learn more about ABS, click here.
How long does a 3D print take?
It depends on the size and complexity of the print, and also on your chosen layer height. A finer, higher resolution print will take much longer, but will look very much smoother.
How much will it cost to print?
This is a very common question, however is it impossible to provide you with an answer remotely close to the actual price you would pay to print your part.
Unlike other 3D printing service centers we charge by amount of material consumed, and not by the outer dimensions of the object, as such objects of the same size may have different prices due to their geometry or shape.
To illustrate the complexity of quoting a price without seeing the corresponding STL file, lets consider three 10cm cubes:
Although these three cubes have the identical outer dimensions, they differ completely on every other aspects, as shown in this table.
|Effective Volume||Weight Consumed||Support Material Consumed||Time|
|Solid Block||1000 ㎤||1999 g||35 g||22:45 h|
|Hollow Box||271 ㎤||560 g||48 g||22:45 h|
|Wireframe||28 ㎤||153 g||239 g||22:45 h|
Which comes down to a 600% price difference between the Solid Block and the Wire Frame cubes.
For objects other than cubes, the price difference is also highly correlated with the quality and capabilities of a 3D modeler, and his or her abilities to design for a specific manufacturing technology.
As design rules are different for each 3D printing or manufacturing technologies, printing something that is designed for one technology while using another might be possible, or might be super expensive.
About fragile and delicate parts
Designs often require the inclusion of fine, delicate and fragile features; features which push the limit of today's 3D printing technology.
We fully understand the need for these features and do our best to ensure they are printed successfully and accurately.
Whenever possible we will identify such fragile and delicate features and provide you with advice and assistance on how to modify your design for a successful print.
However, if you do choose to print parts which we feel are too fragile and delicate, we cannot be held liable for them breaking as we manipulate the parts post-print. In which case the client remains responsible for the cost of printing these parts.
Alternatively, we can deliver you as-out-of-the-printer parts, to which support material remains attached.
Varying the material density will effectively reduce costs of a 3D print. It is to note that varying a models' material density will significantly impact its mechanical properties.
Cost saving through material density variations in FDM 3D prints can be achieved by varying the width of the internal honeycomb scaffolding structure, which will in turn drastically reduces the printing time. The images below show possible honeycomb widths.
In both cases, the shape or external appearance of a model is unaffected.
Our printers feature selectable print resolution choices for a balance of speed and quality, from Ultra-High definition 50 micron layers, a middle 100 micron layer, a large 200 micron layer and a larger 300 micron layer setting where speed and turnaround is the biggest priority.
Below you can see examples of what to expect. These are photos of a domed part around 35 mm in diameter, zoomed in so you can see the difference.
Designing for 3D printing
To successfully 3D print your design please take the following considerations into account:
3D printers have a few mechanical limitations preventing them from creating certain geometries, as such certain considerations must be taken into account during the design process.
For the same reasons, floating surfaces are particularly difficult to print, these include structures such as the bar in the letter 'H' or the arch in the letters 'D', 'O' or 'Q'. We recommend designing floating surfaces using parabolic or pyramidal scaffolds.
For the same reasons, unbalanced structures are particularly difficult to print as they often keel over under the weight, as such we recommend designing parts for their centre of gravity to be above their base.
All FDM 3D printers over-extrude slightly during sharp direction change, as such small details such as holes and saw teeth or points tend to not be as sharp as the design prescribes. These defects can either be fixed by filing or sanding the over extrusion or by designing larger features and by using rounded corners, which effectively dampens the speed of the direction change.
We recommend designing your part following two simple rules (1) the base of the part should be no less than 80% of the largest area and (2) orient the part so that all its features point upwards (as opposed to downwards or sideways).
We prefer, and recommend, designing with Autodesk AliasDesign, Autodesk Inventor, Dassault Systèmes Solidworks, Rhinoceros 3D or PTC Creo Parametric; however if commercial software is not an option, there are excellent free software you can use to do 3D modelling:
To validate, analyse, edit and repair STL meshes, we recommend Autodesk Meshmixer or Netfabb Studio Basic.
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