The issues of the technological complex for manufacturing the hull of a small vessel obtained using additive manufacturing methods are considered in the paper. The purpose of the work is to study the emerging problems, issues, patterns, rules and norms of the process of 3D-printing the hull of a small vessel. The objectives of the paper include presentation of previously obtained calculated and experimental results for printing and assembling the ship hull; development of a method for assembling a hull using additive technology; comparative analysis of the labor intensity of manufacturing ship hulls using traditional and additive technologies; studying the issues of the slipway period of building the hull after completing printing work. The main methods for solving problems include well-known fundamentals in the technology of shipbuilding, ship repair, optimization of ships, technical and economic analysis, materials science, etc.; information about the production of marine equipment objects by additive manufacturing from filaments; the results of our own calculations and experiments for the production of a small vessel hull using additive technologies; well-known industry regulations and standards for working with fiberglass in shipbuilding. The technique of printing and assembling the hull of a small vessel, the necessary preliminary computational-analytical and experimental studies for redesigning the hull structure for additive manufacturing, the problems arising during and after printing and assembling the hull, and the analysis of the labor intensity of manufacturing the hull using additive and traditional technologies are considered. It has been found that not all types of small vessels will have advantages in terms of labor intensity in their additive manufacturing; it is possible to use incremental production. With the right organization of production management, additive technologies will have an advantage in terms of the laboriousness of the technological process in the production of hulls of kayak-type ships, and similar structures in terms of geometry and weight, with individual piece production.

Currently, there is not enough data on the cumulative error in the geometric characteristics of large-sized objects assembled using the technology of gluing in parts. The hull of the small vessel "Nerl" was chosen as a large-sized object created by the FDM method. The deviations of the diameter along mutually perpendicular planes and the heights of the glued products were measured on the example of test specimens of a cylindrical shape and gluings from them. The field of tolerance for glued products made of polylactide was determined. Recommendations for designing large-sized products when printing in parts by the FDM method were issued. The causes for the appearance of geometric deviations of single parts and gluings are described. The main disadvantages of the FDM method related to manufacturing accuracy are considered. Causes of geometric deviations are divided into three groups. The first is related to the parameters of the product material (thermal expansion coefficient, uniformity of the rod and hygroscopicity), the second is related to its design (multiplicity of linear dimensions, layer height and motor pitch, filling parameters, the presence and size of overhanging elements), the third is related to the features of the additive installation ( calibration along the X, Y, and Z axis, extrusion drive calibration, extrusion unit design, acceleration and travel speed, and nozzle diameter). It was found that preparing the production of 3D printing of a large-sized object using the technology of gluing in parts, for example, the hull of a small vessel, it is necessary to additionally take into account the numerical parameters of the layers of adhesive joints.

The article considers the problem of changing vessel stability characteristics due to the optimization of the hull design and the increase in mass due to the choice of polylactide as a hull material for manufacturing by additive technologies. The stability characteristics of a small vessel hull of the "Nerl" kayak type was calculated in two approximations: in the first - for a standard prototype vessel made of fiberglass weighing 35 kg, in the second - for a project under development for additive manufacturing using polylactide weighing 70 kg. Stability was calculated according to the requirements of the Russian River Register using the FreeShip+ and Hydromax software. It was found that not all stability characteristics of the prototype vessel (maximum restoring moment arm) meet the requirements of this register, while for the projected vessel of additive manufacturing all requirements are met. The results of the study may be useful to shipbuilding enterprises planning to organize manufacturing products by 3D printing.