Both of these series of printers have long been discontinued by Ricoh. 
IBM Infoprint 4400 Thermal Printer – 10 IPS
No longer supported due to lack of dependable parts.
InfoPrint 6700 M40 Thermal Printer (mid volume) – 10 IPS
No longer supported; is a more recent printer so parts are still somewhat available.
InfoPrint 6700 Thermal Printer (high volume) – 10 IPS
No longer supported; is a more recent printer so parts are still somewhat available.
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