Surgical guide production apparatus for use in a sterile environment

A cutting attachment for use on a surgical guide production apparatus, the cutting attachment comprising:

• a cutting element;
• a connector for connecting the cutting element to a drive mechanism of the surgical guide production apparatus so that the cutting element can be driven by the drive mechanism to modify an impression of a surgical site to produce a surgical guide;
• and
• a protective barrier comprising a flexible sheet and configured to be positioned around the cutting element to surround a cutting area to help prevent contaminants from entering or leaving the cutting area during modification of the impression;
• and
• a support assembly comprising:
• a lower support, and
• an upper support separate from the lower support, wherein the protective barrier is coupled to the lower support and the upper support, and wherein a radial portion of the flexible sheet extends radially outwards from the cutting element towards the lower support such that the cutting element is radially movable relative to at least the lower support.