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This invention generally relates to printer apparatus and methods and more particularly relates to a printer media Supply Spool adapted to allow the printer to Sense type of media, and method of assembling Same. Pre-press color proofing is a procedure that is used by the printing industry for creating representative images of printed material. This procedure avoids the high cost and time required to actually produce printing plates and also avoids Setting-up a high-Speed, high-volume, printing press to produce a Single example of an intended image on the thermal print media. Otherwise, in the absence of pre-press proofing, the intended image may require Several corrections and be reproduced Several times to Satisfy customer require ments. This results in loSS of profits. By utilizing pre-press color proofing time and money are Saved. A laser thermal printer having half-tone color proofing capabilities is disclosed …