background: this study describes the possibility of implementing three-dimensional printing technology to create a precise construction of a planned bolus, based on computed tomography information stored in the digital imaging and communications in medicine (dicom) format file. materials and methods:  to create the bolus with a 3d printer, we converted data in the dicom format to the stereolith...

A flexible file format for Solid Freeform Fabrication data is presented which significantly improves on the de-facto industry standard STL format. The new format removes the redundancy present in STL files and can contain topological information. Its specification flexibility allows users to balance storage and processing costs. Since facet boundary models currently provide the greatest common ...

A STL file format contains a series of triangles representing the surface model of the part that are being made by Free Form Fabrication technologies. However, recently this file format is being used to interrogate and transfer data between different CAD/ CAM /CAE systems. There are many inherent defects associated with STL files, such as gaps, incorrect normal vectors, overlapping facet, non-m...

The simulation of CMS raw data requires the random selection of one hundred and fifty pileup events from a very large set of files, to be superimposed in memory to the signal event. The use of ROOT I/O for that purpose is quite unusual: the events are not read sequentially but pseudo-randomly, they are not processed one by one in memory but by bunches, and they do not contain orthodox ROOT obje...

There are many applications where data structures use a hash function. The hash data structures are widely used across all fields of computer science. Nevertheless the design or selection of hash function for data sets with unknown properties is a problem. The Rapid Prototyping uses STL format, where a set of triangles is used to represent a surface of the object. It is necessary to construct t...

Robotic wire-feed additive manufacturing technology is possible to directly fabricate metallic overhangs without support structures through multi-direction deposition. To automatically produce complex components with overhangs, an efficient multi-direction slicing algorithm to slice CAD models into a set of proper layers is required. This paper reports the concept and implementation of a new st...

A processing algorithm for freeform fabrication of heterogeneous structures is presented. The algorithm was developed based on the heterogeneous fabrication structural model, which was constructed from the STL based multi-material volume regions and with material identifications. The reasoning Boolean operation based modelling approach was used to construct the heterogeneous CAD assembly and to...

Abstract Selecting a suitable file format for data exchange in additive manufacturing is fundamental when designing these digital process chains. Within the scope of this investigation, alternatives to de-facto industry standard STL are be found overcome disadvantages STL-based chain. Therefore, formats identified by conducting literature and market research evaluated regarding their suitabilit...

Free Form Fabrication (FFF) machines transform objects merely existing as Os or 1s in a computer into a tangible object. FFF machines shift the paradigm of standard 2 Dimensional printers/paper printouts to 3 Dimensional printers/volumetric printouts (or 3D hardcopies). Currently, this technology is weakened by the link between computers and FFF machines: the .STL file, which contains a series ...