MF series

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MF
Series information
Type Two drum
StatusActive
Launched2017
TaglineMulticolored Force

Resources

Tutorials

The following user created tutorials apply to the MF series.

Maintenance

Replacement parts

NamePart no.StockUnit
Feed tire

035-14303 021-14301

 2 / riso Paper feed
The two matching rollers in the 1st paper feed—the outer one is the "scraper" (feeds multiple sheets in) and the inner one is the "pickup" (separates the top sheet). Each is an inner plastic core and outer tire (this is the part for the tire).
  • The inner (pickup) roller should use OEM, the outer (scraper) roller can use generic—generic tires tend to be eccentric (egg-shaped) and a smaller diameter than the originals.
  • The RP uses 3 rollers, two of which are tires on a proprietary core, but the third roller requires a solid feed tire.
Stripper pad

019-11833

 3 / riso Paper feed
The stripper pad puts upward force and friction on the multiple pages that are fed into the pickup roller, so that the teeth of the tire only propel the top sheet into the riso. It is the rubber part that wears the fastest and must be replaced regularly for stable paper feed.
  • Very old risos may use a different stripper unit, which takes an older stripper pad type (a thin square), otherwise this part is universal.
  • An alternative grey stripper pad is listed under part no. 019-11834—it uses a harder material, which is meant to last longer and be better for heavier paper stocks.
Feed roller core

023-12306 021-14302

 1 / riso Paper feed
The plastic core of the feed rollers (the feed tires are stretched around these) contains a one-way bearing, which allows the paper to be pulled freely through the 1st paper feed by the 2nd paper feed and press sections.
  • This bearing wears down over time, which will either decrease the feed power or cause the roller to drag on the rest of the system.
  • Replacement cores ship dry, and will need oiling.
Elevator shaft gear

023-12215

 1 set Paper feed
Two of these gears transport the elevator up and down. When the elevator is damaged the teeth will snap off these plastic gears—a 3 mm roll pin punch is needed to replace them.
Flaw bearing

600-50057

 2 / riso Paper feed
Four of these are used in the elevator, they are very delicate and will break apart if the elevator is damaged.
Lock plate B

030-14130

 1 set Paper feed
A pair of these is responsible for locking down the side guides on metal feed trays. If the guides are forced apart while locked, these pieces will break.
Separator needle (Z+)

023-21002 024-21038

 1 / riso Paper ejection
This needle is responsible for peeling paper off of the drum in the ejection process—if damaged (or improperly calibrated) paper will stick to the drum more and/or the needle will leave a drag mark down the center of the print.
  • In the rare occurrence of catastrophic drum failure inside the riso, the separator needle will often smash against the surface of the drum (or catch under clamp)—as a result of (1) being adjusted too close to the drum, or (2) a component of the drum raising too high off the surface of it.
  • Usually this harms the drum more than the needle, but sometimes the needle shatters too. The riso can operate without the needle (so long as the rubber hose is kept out of the paper path)—but the paper will stick to the drum more frequently.
  • There are two versions of this needle—the sharper, earlier needle is part no. 023-21002, while the newer snub-nosed needle is part no. 024-21038—they can be used interchangeably, so long as they are properly recalibrated.
  • The separator needle position should always be calibrated after changing the needle.
Exit belts (Z+) (two-drum)

629-00004

 1 set Paper ejection
Exit belts transport paper out of the riso—usually a suction fan pulls air down through holes in the belts to hold the paper to them while a dedicated motor powers the belts. In two-drum machines the exit belts are a set of 3 thin belts with holes running along them.
  • Note that these belts appear very similar to one-drum belts, but they are a slightly different length and are not interchangeable.
  • As they wear, they will stretch out and slip on their rollers—paper will become stuck in the exit area (particularly larger sheets of heavier stocks).
  • Belts can be tested by dragging them with a fingertip—all the belts should move together—if individual belts slip, it's a sign that all should be replaced.
Midfeed belts

629-00003

 1 set Paper ejection
Two-drum machines also have a set of 4 shorter belts (with holes in them), which transport the paper between the two drum positions.
  • When testing these belts, all 4 should feel locked when trying to drag them with a fingertip.
TPH gear

612-10010

 2 / riso Master making
This small plastic gear is part of the TPH pressure system—when it fails the riso will no longer be able to lift the thermal printhead, and will throw a T19 or P19 error.
  • This is a critical part—when it breaks the riso will be fully non-operable until it is replaced. They break every 3–7 years.
  • Instructions for replacement are available at: Thermal-pressure motor lock (TPH gear)
Transport bands (Z+) (two-drum) (feed side)

628-00002

 1 set / riso Master removal
A set of 4 small rubber bands (o-rings) which are used to transport the stencil off of the 1st drum position (paper feed side) and into the disposal box. When they break, the stencil will become more easily jammed between the disposal rollers.
  • Note that the transport bands for the 1st drum and 2nd drum sides of two-drum machines are different and not-interchangeable (they are also different from one-drum transport bands).
  • These parts can often be easily replaced with generic o-rings of a similar (or slightly smaller) size.
    • The Japanese size for these is listed as 2×130 (2 mm cross section and 130 center circumference) or S40 (a JIS designation).
    • The closest ISO size is A0380 (1.8 mm cross section, and 38.7 mm inner diameter).
    • In imperial sizes these bands have a 1/16" cross section—the closest commonly available size is ⌀ 1⅝ in (outer diameter)—however in practice, slightly smaller o-rings (down to ⌀ 1⅜ in) have been more effective.
  • All of the bands in the set should be replaced at the same time.
Transport bands (Z+) (two-drum) (ejection side)

628-00001

 1 set / riso Master removal
A set of 4 small rubber bands (o-rings) which are used to transport the stencil off of the 2nd drum position (paper ejection side) and into the disposal box. When they break, the stencil will become more easily jammed between the disposal rollers.
  • Note that the transport bands for the 1st drum and 2nd drum sides of two-drum machines are different and not-interchangeable (they are also different from one-drum transport bands).
  • These parts can often be easily replaced with generic o-rings of a similar (or slightly smaller) size.
    • The Japanese size for these is listed as 2×112 (2 mm cross section and 112 center circumference) or S35.5 (a JIS designation).
    • The closest ISO size is A0345 (1.8 mm cross section, and 34.5 mm inner diameter).
    • In imperial sizes these bands have a 1/16" cross section—the closest commonly available size is ⌀ 1½ in (outer diameter)—however in practice, slightly smaller o-rings (down to ⌀ 1¼ in) have been more effective.
  • All of the bands in the set should be replaced at the same time.

Specifications

 Print areaDPIYear
MF9350A36002017
MF9450Ledger6002017

Usage

There are 23 places printing with MF duplicators (5% of all active places).

MF9350Artefakt Press 🇯🇵Atelier Fluo 🇫🇷Faust Éditions 🇫🇷Keda*press 🇬🇷My monkey 🇫🇷NOT GUTTER 🇯🇵Pale Fruits Press 🇨🇳Pamflett 🇳🇴Punch Kiss Press 🇺🇸Riso Attic 🇳🇱Stencilwerck 🇳🇱
MF9450ANEMONE 🇺🇸CCS Imaging Center 🇺🇸Cal Poly RI-SLO Studio and Zine Library 🇺🇸Corporate Earth 🇺🇸Emily Carr University of Art + Design 🇨🇦Northeastern Illinois University 🇺🇸Secret Riso Club 🇺🇸Stamps School of Art & Design 🇺🇸Texas State University 🇺🇸The Riso Room at the University of Missouri SVS 🇺🇸Theretherenow. 🇺🇸Lucky risograph 🇺🇸
Loading map...

A map of the 23 places printing with MF duplicators—as listed in the Atlas.

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