Obsolete consumables

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Riso Kagaku has officially discontinued supplies for all duplicator lines older than the —however, newer consumables can be modified to continue support for RPRN machines.

Both new inks and new stencils can be used in older machines—by modifying the ink tubes to be recognized by the riso and modifying the riso to accept the new stencil rolls.

Ink cartridges

While the ink itself is mostly interchangeable, there are two major differences between older and newer ink tubes:

1. Older ink tubes have a larger nozzle (which facilitates the slower ink pumping that happens with the piston pumps used in older drums) whereas newer tubes have a smaller nozzle (for the rotary pumps that move ink more quickly).
2. Older tubes have one or more physical tabs which push buttons inside the drum—these identify what kind of tube it is and that there is a tube inserted at all. Newer tubes use an RFID sticker and a reader inside the drum.

Getting newer ink to work in older machines is a matter of either:

• Transferring ink from a new tube to an old tube with an ink tube transfer.
• Modifying a new tube to enlarge the nozzle and add a tab (often using a 3D printed ink tab).

Stencil rolls

The stencil material from different rolls can generally be used across machines, but the newer cardboard rolls themselves don't fit into plastic flanges/spools used by the older models. The most common method to get newer rolls to fit is to 3D print new flanges (or otherwise modify existing flanges to fit the new rolls).