The printing of the main building is simple and should print easily on any heat-bed to scale, but preferably a 200x200mm size is required to meet the 28mm scale. This piece can be printed larger to epic scale on larger print-beds or by slicing the model up into quarters and printing each part separately. A base of the appropriate size can then be chosen or, constructed if larger is needed, to place underneath.
To print the Gyroscope part, make sure your print-bed level is optimum and print at a layer height of 15 microns or lower. The parts then need to be cleaned out and glued to the domed roof of the building. The outer gyroscope, the sextant, glues on to the domed roof brim, whilst the inner ring is glued to the top most part of the roof. It is recommended that you pin and glue the inner ring, to ensure that it will not loosen and fall.
With the inner piece of the gyroscope, it is recommended to use a small piece of wire to pin it in place with glue. You can rig it so that the wire acts like an axle piece and this will allow you to move the piece around to get the best angle before glueing it. If pinned, you may also chose not to glue it in place so that it can be used as a moving display piece.
These prints do not require any supports and print easily in PLA. Use the standard model with a low layer height of 15 microns to obtain an incredible detailed piece, but this can take over 30 hours print time, so if time is a premium to you, you are probably better off with a low resolution and a layer height of 20 to 24 microns.