a three - dimensional printing device has at least one collapsible vertical or horizontal axis using a scissor lift mechanism . one of the horizontal axis &# 39 ; s can be made operable via a track or path where the entire machine moves along that path via movable wheels or gears . sensors may monitor the height , orientation , position , and relative distance of the axes , machine , or extruders . compensating mechanisms such as counterweights , propellers , or gyroscopes may be used to maintain balance , levelness , and control of the system . as a result , the size and weight of the 3d printer is reduced and made easier to transport while maintaining quality build functionality .