Home / Food preserving

KoMo grain mill: match the model, ingredients and voltage

By the Plain Prepper editors. Updated 2026-10-14.

We research products from makers' specs, manuals and safety agencies; we do not run hands-on tests. Links to Amazon may earn us a commission at no cost to you. How this works.

Quick answer

Choose a KoMo mill by its model-specific grain permissions and the correct electrical version. Fidibus 21 is the smaller 250 W option for the maker's soft-grain category; Fidibus Classic and KoMoMio list 360 W and support additional ingredient categories. Their current wheat milling-rate labels are similar, while hopper capacities differ. Get the U.S. 110 to 120 V version for that supply, confirm physical dimensions and follow the stone-care instructions. A mill's flour remains raw food.

Choose the grain permissions before the housing

KoMo uses corundum-ceramic stones and hopper-based texture adjustment in these electric household mills. The model name matters more than the shared mechanism when deciding what to feed it.

The current maker overview permits soft grains and spices in Fidibus 21, but excludes its hard-grain category, legumes, oilseeds and coffee. KoMo classifies wheat, spelt and rye among the soft-grain examples on its pages. Do not translate that category into a blanket ban on an ingredient simply because its name contains hard wheat.

Fidibus Classic and KoMoMio are listed for soft and hard grain categories, legumes, spices and coffee, while still excluding oilseeds. Check the actual ingredient and intended form against the current overview. Corn, beans or a spice mixture should not be selected merely because another mill accepts it.

A KoMo flaker is a separate device that produces flakes. Its ingredient permissions and preparation directions are not the electric flour mill's instructions. Keep the matching model's operation and food list together.

Compare current maker figures with their conditions

Model	Motor label	Wheat hopper	Listed wheat milling rate	Stone diameter
Fidibus 21	250 W	About 850 g	About 100 g/min	75 mm
Fidibus Classic	360 W	About 1,000 g	About 100 g/min	85 mm
KoMoMio	360 W	About 1,200 g	About 100 g/min	85 mm

These are the manufacturer's current product figures, not comparative output measurements. The same wheat-rate label does not prove equal output for every ingredient, setting or supplied revision.

The Classic's hopper is 150 g above Fidibus 21, and KoMoMio adds 200 g above Classic. Those differences describe listed wheat capacity, not how much of every grain will fit or how much food a household needs.

KoMoMio uses a mixed-material housing and beech hopper; Classic uses solid beech, while Fidibus 21 uses a veneered plywood housing. Choose the case and receiving space alongside ingredient permission, rather than inferring flour quality from the cabinet.

Check the actual package. The current maker descriptions list the mill and lid. Confirm receiving-bowl contents in the actual offer and plan a bowl that fits below the outlet.

Verify the electrical version and resolve the voltage-page typo

KoMo offers different mains versions. Its variants page describes the U.S. model for 110 to 120 V with a Type B plug. The European description specifies 220 to 240 V and a different plug. Confirm the actual appliance rating plate and offer before purchase.

That same maker page labels the European option as 270 V in its heading and list, despite describing 220 to 240 V in the body. This is conflicting documentation, not permission to use a 270 V supply. Rely on a confirmed nameplate and matching manufacturer instructions, and seek clarification if an offer repeats the inconsistent label.

A plug adapter is not evidence that a motor is suitable for another supply voltage. The maker warns that incorrect voltage can damage the mill. Select the intended electrical version instead of assuming every KoMo with the same wood case has the same connection.

The linked English operating booklet requires a suitable socket, a hard support surface and ventilation beneath the device. It prohibits multiple plugs and extension cables, unattended operation and opening the mill while connected to power. Check those requirements before arranging the workspace.

Use current dimensions without hiding the linked-catalog differences

The current product pages list height, width and depth in centimeters: Fidibus 21 at 33 by 18 by 23; Classic at 33 by 19 by 23; KoMoMio at 37 by 20 by 21. These are maker-page references, not confirmation of the particular U.S. offer's dimensions.

The English catalog still linked from the current download page gives different dimensions for the Fidibus models: 32.4 by 15.3 by 21.3 cm for Fidibus 21 and 33 by 16 by 21.3 cm for Classic. Do not silently use those narrower dimensions for a tight cabinet installation. Confirm the supplied version with the maker.

KoMoMio's current page lists 8 kg, while the linked catalog lists 7 kg. The catalog also contains differing KoMoMio dimensional rows. These discrepancies need actual model and revision confirmation; they are not resolved by choosing whichever figure suits a space.

Current outlet clearances are 11.5 cm for Fidibus 21, 12.3 cm for Classic and 13 cm for KoMoMio. Confirm that the receiving bowl and working position fit, with enough access to load and adjust the hopper.

Follow the mill instructions, not the flaker or another brand

KoMo's electric-mill instructions say to start the device, adjust texture by turning the hopper and then add grain. They describe changing the adjustment while the mechanism is empty or milling. Follow that sequence for the matching model rather than importing a hand mill's rule.

The booklet says to mill flour only once. Refeeding finished flour will not improve fineness as intended and can smear the stones. This is distinct from the coarse-rice cleaning procedure described for a fouled mechanism.

Use clean, dry ingredients. The current overview excludes oily seeds and warns that damp material sticks to the stones. It also lists oats among exclusions in its general text, while the linked English booklet includes oats in a general grain list. Obtain current model-specific confirmation of the allowed oat form before milling; do not choose either statement silently.

For cleaning, unplug the mill before opening it, use the prescribed dry stone-cleaning method and avoid a wet brush. Keep tools and fingers out of the running mechanism. Have authorized personnel handle repairs rather than modifying the drive or casing.

Consider separation accessories without assuming food-safety approval

KoMo documents an interchangeable milling arrangement for separating different milling uses. Confirm the exact compatible accessory, model and intended ingredient with the maker. A separate grinding arrangement is not proof that every other contact surface or used appliance is free of wheat exposure.

The flour sifter is also a separate accessory with its own mounting and operating instructions. It changes the handling of flour; it does not authorize feeding a prohibited ingredient through the mill or turn raw flour into ready-to-eat food.

FDA says processing raw grains into flour does not kill harmful bacteria. Prepare flour-containing food with the appropriate cooking or baking directions. Keep raw flour away from ready-to-eat food, wash hands and food work surfaces afterward, and do not taste raw dough or use it for children's play.

FDA also says not to heat-treat flour at home to make raw eating safe. Keep food-area washing separate from stone care. Confirm the U.S. version, supported grains, actual dimensions, bowl and supplied accessories before choosing an Amazon offer.

What to look for when you buy

Questions people ask

What are the millstones in these KoMo mills?

KoMo lists corundum-ceramic grinding stones. The current Fidibus 21 page lists 75 mm diameter; Classic and KoMoMio list 85 mm. Follow the matching dry-cleaning and texture instructions.

Can Fidibus 21 grind everything Classic accepts?

No. The current maker overview excludes hard-grain categories, legumes and coffee for Fidibus 21 while listing those categories for Classic. Check the specific grain and form; oilseeds remain excluded from both.

Can I grind flour again for a finer result?

The linked KoMo booklet says to mill flour only once because repeated flour milling can smear the stones. Use the supported texture adjustment; do not confuse flour refeeding with its coarse-grain cleaning procedure.

Which KoMo voltage version should I choose in the U.S.?

Choose the manufacturer-confirmed 110 to 120 V U.S. version and check the actual rating plate and instructions. A plug adapter or the maker page's contradictory 270 V European heading does not establish compatibility.

Sources

• Fidibus 21, current maker specifications in German, KoMo
• Fidibus Classic, current maker specifications in German, KoMo
• KoMoMio, current maker specifications in German, KoMo
• Electrical variants: U.S. supply and conflicting European label, KoMo
• Current model-specific milling overview and ingredient warnings, KoMo
• English operating booklet, current download-page-linked document, KoMo
• English product catalog, current download-page-linked document, KoMo
• Handling Flour Safely: What You Need to Know, FDA

Sources checked 2026-10-14.