A flatbed plotter consist of a stationary horizontal flatsurface on which paper is fixed
www.lexmark.com has parts diagrams, and you can order from their site.
Also check out www.fixyourownprinter.com for help with fixing a variety of
While I support TravisO's answer, I would like to clarify a couple things. First, laser printers do not "burn" toner onto the paper to complete the printing cycle. Instead, they actually just melt the toner so as to bond it to the paper. This is accomplished by the fusing assembly which is quite simply a teflon-coated glass tube with an old-tech vacuum tube or other heat source inside. It generates about 350 degrees Fahrenheit (about 177 degrees Celsius) of heat which melts the fine plastic powder that is the toner and bonds it to the paper.
Second, as TravisO said, standard transparencies are not usable in printers because in a laser printer, the heat of the fusing assemly will soften the plastic of the transparency and potentially turn it into a viscous sludge which will gum up the fuser and/or other parts inside the printer, requiring costly repairs. In an inkjet printer, standard transparencies will not work because they are not designed to absorb standard ink designed for paper. Instead, they are designed to be marked upon by wet erase markers (and, therefore, the reason that to clean off such transparencies, one holds them under a stream of water). So, in both cases, one must get transparencies that are designed for the appropriate type of printer. Any office supply store such as Staples should have either of these in stock.
Here's what you are looking for, just open the link in the related links section, and select the printer you have.