The main difficulties of an excellent finish in 3D printing manufactured
pieces are due to the complex situation of the resulting surface, very rough,
not smooth and with imperfections. The substrate’s preparation is therefore
essential. The difficulties are mainly due to the different materials used to
produce in additive printing. In particular, the different materials used need
a specific printing technology that does not require coating because already
mass coloured. In fact, are also used natural materials such as clay, composite
materials, biomaterials and even food. As a result of various tests made with Anver
coordination and with the collaboration of some sector companies, currently it
is believed that the best solution for the printed support coating preparation
is mechanical processing: excluding, however, blasting, which is not decisive
with these particular manufactured items. The appropriate technologies to
achieve good results are two: the mechanical cleaning for very large pieces, the
most specialized company is undoubtedly the Pulimetal Cittadini, located in
Provaglio d’Iseo (BS), and the vibratory finishing for small parts and small
pieces, the company that carried out some tests is Rosler Italiana located in
Concorezzo (MB). For the final coating are available truly innovative
solutions, unique in their kind, with the application of conductive carbon
nanotube-based primers, which allow the electrostatic finishing with any liquid
(or powder) coating, with a significant reduction in overspray, created instead
with the pneumatic spraying. Although the coating system must be completely
redesigned, due to the low number of molded parts to be treated, so that the
laboratories where printing in additive technology can adopt appropriate
equipment for the coating of different manufactured items, without resorting to
subcontractors.
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