3D printing has risen in popularity due to its capabilities which enable rapid prototyping and printing structures that were impossible to produce before and partially because of technological development in recent years. Most low-cost printers, based on the fused filament fabrication process, are capable of printing a single filament at a time that limits and complicates multicolor and multi-material 3D printing. Therefore, investigating and building a multicolor 3D printer have been chosen as a degree project in order to provide an understanding for multicolor 3D printing. The project was started with an investigation of different possibilities and potential solutions. After that, a visual CAD model was created in Solid Edge, and a virtual model was constructed by using Acumen. Lastly, accumulated ideas were implemented into creating a prototype. Construction of the prototype was accomplished successfully, and several experiments were executed to determine its capabilities and limitations. The results showed that the printer has high precision in XY-plane and is less precise in Z-axis. The printer was able to print 45 different colored objects, of which only 24 were chosen as distinct colors that the human eye could distinguish. One of the main challenges with a single nozzle multicolor 3D printing compared to a single-color printing is constant heatsink clogging. Another challenge is to create a well-integrated system where hardware and software comply perfectly in a manner that desired prints are obtained. / Se dokumentfil

The diploma thesis deals with the influence of building modifications in the form of thermal insulation of the external cladding and replacement of windows on the energy performance of the building. In addition to the building modifications, the influence of heating regulation and hot water preparation on the energy performance of the building is assessed. These facts are analyzed for two older, just reconstructed, houses of similar size. Heat - technical calculations are made in the TV program of the company Protech, Nový Bor. The output is an analysis of simple return on investment in individual measures. In its second part, the thesis deals with the design of several examples of regulation. It concerns the regulation of underfloor heating, solar collector using one storage tank, solar collector using two storage tanks and automatic closing of the storage tank of the heating system. The electronics of the controllers are solved by the Arduino Mega 2560 chip. In addition to the programmable arduino chip, the three-way valve, temperature sensor and pump are used for underfloor heating. The solar system uses solar collector, temperature sensors, storage tanks, programmable Arduino chip, pumps, solenoid valve and LCD display. The automatic closing of the accumulation tank uses the solenoid valve, temperature sensor, pump and Arduino.