Our RL2895 is the same size and configuration as DYMO's 30334. According to DYMO's site, the 30334 can be used with DYMO LabelWriter 4XL, LabelWriter 450, LabelWriter Wireless, LabelWriter 450 Duo, LabelWriter 450 Turbo, LabelWriter 450 Twin Turbo, and Desktop Mailing Solution. At this time their site does not confirm if it is compatible with the DYMO 550 model so you may want to reach out to DYMO directly for verification.