# Review and New Aspects in Combining Multipoint Moulding and Additive Manufacturing
## 3 Possible Additive Manufacturing Methods
### Additive Manufacturing on Silicone Made Building Platform  
The aim of current research is to develop enhanced vacuum-assisted multipoint moulding with additive attachments a continuous process for manufacturing with a vacuum assisted multipoint mould. As already mentioned, it is necessary to place additional additively manufactured attachments on the interpolation layer at certain points in order to be able to map a larger part spectrum. Moreover, it should be possible to adjust the machine without any further intervention by an employee. Therefore, the system must be able to produce the attachments directly in one plant. As the vacuum-assisted multipoint moulding for carbon fibre-reinforced plastics uses a silicone interpolation layer [23], the attachments must be manufactured on a silicone building platform. In the literature, there are already some processes outlined which produce directly on existing components and thus deviate from the usual flat building platforms. Among the procedures of laser-sintering the method of [PERSON] et al. [31; 32] should be mentioned. They are developing a metal-based process that uses an inert gas jet to bring metal powder to the point of material application. The powder is melted at its destination by a laser beam and thus bonded to the underlying layer. They are reducing the laser power to minimise the temperature load on the substrate. Nevertheless, the images show a clear heat influence on the base material. Therefore, the process is ruled out for an application on silicone. [PERSON] et al. [69] present a process resulting from the adaption of a standard fused filament fabrication machine. Due to the conversions made to the machine used by them, it is possible to manufacture on already existing components and to consider uneven subsoil structures. The results show that production on existing components is possible, even if these components do not have a flat surface. However, the original components also consisted of an acrylonitrile butadiene styrene (ABS) or Acrylonitrile butadiene styrene/polycarbonate (PC) mixture, which shows a certain similarity to the acrylonitrile butadiene styrene used for fused filament fabrication. For these material combinations, joining forces in the area of an industrial adhesive bond could be demonstrated. However, the shown process has clear disadvantages in the area of accuracies, which decrease significantly compared to production on a commercial fused filament fabrication plant. [PERSON] et al. [38] also show in their work on the concept study for direct printing for wound care that production on curved surfaces is possible using a robot arm. A similar concern is pursued by [PERSON] et al. [70] with their approach to the repair of components and the associated direct production on curved components. However, they use a delta printer. In addition, the method is supplemented by real-time image evaluation for control with respect to the subsoil. A possible approach for problems with the adhesion of the actual component to the surface of the additive attachments could be the method of [PERSON] et al. [71]. A nanostructure is applied to components produced by fused filament fabrication using a stereolithographic process. This method offers the opportunity to add different nanostructures to the part. The test results show high accuracy. This could make it possible to prevent undesirable adhesion by means of such a nanostructure. On the other hand, to use this process in terms of controlling the adhesion of the part on the interpolation layer it would require removing the part from the interpolation layer or building it in a separate machine and add the nanostructure in a separate process. This leads to an extra positioning process of the additive manufactured attachment which is challenging on a freeform surface and therefore not suitable for a fully integrated process. [PERSON] et al. [72], on the other hand, investigate the factors influencing adhesion in additively manufactured composite materials made of textile fibres and plastics.