Preset optical components in a computer numerically controlled machine

A system comprising:

• a head of a computer numerically controlled machine configured to deliver, to a material at least partially contained within an interior space of the computer numerically controlled machine, an electromagnetic energy to cause a change in the material;
• a source emitting the electromagnetic energy delivered by the head;
• a sealed optical system comprising a housing and a plurality of optical elements enclosed in the housing, the plurality of optical elements including a first optical element and a second optical element oriented at a fixed angle relative to each other, the fixed angle having a magnitude configured to direct the electromagnetic energy from the source of the electromagnetic energy to the head;
• and
• an adjustment mechanism configured to adjust a position and/or an orientation of the sealed optical system without changing the fixed angle between the first optical element and the second optical element, the adjustment mechanism comprising one or more pivots configured to rotate the sealed optical system in order to adjust a separation between the incoming beam of electromagnetic energy and the outgoing beam of electromagnetic energy.