I hear that maintenance services for my µR1000/µR1800 have been discontinued. Do you offer consumables (pens, plotter pens, ribbon cassettes, and chart paper)?

Yes. Those consumables for the µR1000/µR1800 are the same as those for the current product, the µR10000/µR20000.
Please see genuine products list page below.
"Recorder's Consumables (Chart Papers, Pens, Ribbon cassettes)"

µR1000 Industrial Recorders

Model Names: 436001, 436002, 436003, 436004, 436006, 436021, 436022, 436023 and 436024

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µR10000 & µR20000

The μR series are the compact industrial recorders with the recording widths of 100 mm (μR10000) and 180 mm (μR20000). Measured data can be saved to an SD memory card while recording on chart paper.

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µR1800 Industrial Recorders

Model Names: 437001, 437002, 437003, 437004, 437006, 437012, 437018 and 437024

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