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Monster Mill MM3 Grain Mill Complete Packages

Monster Mill MM3 Grain Mill Complete Packages

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Includes Extension?: 

A complete kit that includes the Monster MM3 mill and hopper, with or without the extension. Monster mills are known for being great quality, top of the line, homebrewing mills. With all the great features of the already popular MM-2, and the addition of a third roller, you'll be able to achieve the best crush around, at a higher throughput speed. The MM-3 crushes all your grain twice, with one pass through the mill. It starts with a preliminary crush through the initial fixed gap between the top two rollers, and then ends with a pass through the second gap between the drive roller, and the bottom third roller. The initial pass slightly flattens the grain, and gets it ready for the next crush, that breaks apart the grains and loosens the starch with minimal husk damage.

The MM-3 consists of a 6061 aluminum block frame with three 6" long steel rollers riding on SAE 841 oil impregnated bronze bushings. We use a superior grade of steel that is much harder than what is found on most comparable products and should last almost twice as long. The drive shaft, and all the axles are integral to the roller rather than screwed into the ends. This makes it fine to drive the mill clockwise, or counter-clockwise. All the axles are 3/8", with minimal freeplay in the bushings.

One knurled steel roller is driven by a standard electric drill (not included) to feed the grain through the initial fixed gap of approximately .060", and then through the adjustable secondary gap and crush the grist. Both ends of the non-driven top idler roller ride in bronze bushings that are pressed into the frames, while the second idler roller rides in bushings that are offset mounted in an adjustable knob. The knob is held in a fixed position by a set-screw that you can loosen to adjust the mill. This system provides an adjustment range of .065". The knobs are made from 303 stainless steel for excellent durability, and are larger in diameter than the competition, as well as knurled for a positive grip. They've also added a groove in our newest design knobs with a matching rounded head on the thumbscrew that allows for a much better grip on the knob to avoid gap changes while milling, and also providing knob retention.

These Packages come complete with a Base, 3 Roller Monster Mill Body, and a Hopper.  Choose whether to include the Hopper Extension, which upgrades Hopper capacity to a huge 39 lb! 


  • Three six-inch steel rollers form two gaps, a preliminary fixed gap of approx .060", and a fully adjustable secondary gap.
  • Dual eccentric adjusters: 0 to .065" secondary gap - built from STAINLESS STEEL for no galling
  • 8 lbs / minute throughput
  • 3 x 6" hardened steel rollers
  • Rollers last for 12,000 - 15,000 lbs of grain
  • Drill-drive - CW, OR CCW
  • Alloy frame
  • SAE 841 oil impregnated bronze bushings
  • 1.5" diameter steel rollers
  • 3/8" integral drive shaft w/3 flats for drill driving, 2" long outside frame
  • 1144 alloy steel rollers
Community Q&A

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Why did you choose this?
MoreFlavor Store
Positive reviews
Andermahr F on Dec 4, 2018
want to bea able to just buy big sacks of unmilled grain in the future
Rory D on Nov 25, 2018
Positive reviews
Andermahr F on Dec 4, 2018
The reviews were great, called and received excellent help from the employee over the phone who answered my questions about this item, and it was in my price range
Lauren A L on Nov 29, 2018
want to bea able to just buy big sacks of unmilled grain in the future
Rory D on Nov 25, 2018
Need it for Brewery. Ours died. Will also use for home brewing maybe
Nathan Todd on Nov 17, 2018
Heard it was the best out there
Jonathan M on Oct 1, 2018
researched mills and settled on this one
Randall S on Sep 21, 2018
they are supposed to be the best out there for homebrewers
daniel l g on Sep 21, 2018
great reviews and we need a grain mill, our local beer making supplier is getting out of the business.
Carol B on Sep 14, 2018
Product had very high ratings
Michael A on Aug 30, 2018
To have the ability to mill grain at desired crush settings (i.e. more finely than in LHBS)
Brian T on Aug 28, 2018
Comes highly recommended. Looking for a long-lasting, quality mill
Jonathan G on Aug 8, 2018
Decided to upgrade from a barley crusher-expecting a more consistent crush and better efficiency.
Bill K on Jul 31, 2018
need a new mill and don't want another sub par piece of equipment
Clive D on Jul 14, 2018
Reputation and quality of product. Price was the best I could find, and I like Morebeer.
John H on Jul 2, 2018
well reviewed. fast milling. my BC is dying.
charles b on Jun 26, 2018
used one at local brew shop/ plus reviews
jerry b on Jun 26, 2018
The 3 rollers and positive feedback from others that purchased.
Robert M on May 22, 2018
The best mill around
Mlle H M on May 8, 2018
appears to be the very best hobby mill available
Neil F on Apr 9, 2018
One of the best 3 roll mills available
Brian S on Mar 16, 2018
my barley crusher broke and I needed a newer and larger grain mill
kyle borowsky on Mar 16, 2018
Opening a small brewery and need to mill grain quick
Kyle Hunter S on Mar 6, 2018
seemed like the better quality roller mill
greg e on Feb 24, 2018
to upgrade from my 2 roller mill that only holds 7 lbs of grain. Monster Mills seem to be the highest reviewed.
Mr. S on Feb 6, 2018
Brewer's recommendation
John W on Jan 18, 2018
The reviews were great, called and received excellent help from the employee over the phone who answered my questions about this item, and it was in my price range
Lauren A L on Nov 29, 2018
Need it for Brewery. Ours died. Will also use for home brewing maybe
Nathan Todd on Nov 17, 2018
Can this mill be used with the high torque motor?
Kirk D Fabbri on Sep 28, 2018
Monster Mill MM3 - Complete 3 Roller Mill Packages
Monster Mill MM3 - Complete 3 Roller Mill Packages
Malt Muncher High Torque Motor
Malt Muncher High Torque Motor
BEST ANSWER: Yes, but the mill and the motor don't have the same size shafts. So, you'll need to buy a flexible shaft coupling hub that'll allow you to match the two different size shafts. McMaster Carr sells them online. Their part number is 6408k14. You'll need two, one with 3/8" diameter and one with 12mm diameter. Then you'll need part 6408k75 to hold them together. Hope that helps.
What is the capacity without the hopper extension?
JEFF M on Oct 4, 2018
BEST ANSWER: 11lbs. Awesome Mill too, never had any issues

4.9 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Best Mill Ever
This three (3( roll mill is the best of the best. Highly recommended.
November 2, 2018
2 months ago
Great mill
My only complaint is that the second page of instructions (for putting the hopper together) was hidden under the packing peanuts in the hopper box. It was straightforward enough to put together without them though. The mill works great and replaces my old Barley Crusher. I get a more consistent crush with better separation of the grist from the husks. About the same efficiency so far, we'll see if I decide to adjust the gap later. The second roller puts quite a bit more torque on the drill-brace it against your knee or something to avoid a sudden twist of your wrist when the third roller catches.
August 14, 2018
4 months ago
Likely the last mill I’ll ever own
I looked at several other mills before deciding on th MM-3, most were a lot less money. I was impressed by the design features and thrilled I could actually buy an American product actually made here. I ran a pound and a half of barley at different setting to clean it prior to use and to see what the crush looked like. I got what I’d hoped for: everything from barely cracked to near flour. Did I need this much mill? Of course! It’s amazing and I love it, and I won’t likely ever wear it out. I got the hopper extension that expands capacity to 38 lbs. too. When SWMBO gives the green light, go for it!
Tried to drive it with my 18v cordless drill and it just wasn’t enough to get through the 18 lbs I needed to brew a few days later. At .025 gap, it bound up-this was wheat BTW. .032 was better, but I don’t want to run it twice and it drained the battery quick. Wider gaps might be more forgiving, but I’m playing with BIAB, so tighter gaps are a given. Bought a 1/2” keyed chuck drill from Harbor Freight for 30.00, and it ripped through my grain bill in no time. More torque to drive this mill is a definitely a good thing.
Others have mentioned what a pain it is to change the gap. I experimented with feeler gauges at different settings and marked and labeled them on the frame and adjusting knobs, so resetting now is two thumb screws and the knobs. No sweat.
I wish the base it comes with was bigger. I’d like to be able to support the drill on it, and maybe mount a speed control for the drill, but this a minor pick. If you love quality tools that will probably outlive you, buy this mill!
July 18, 2018
5 months ago
The best of the best so far
July 9, 2018
9 months ago
Response from MoreFlavor
These are great mills.
July 16, 2018
Zach R Staff
Would give this a 4.5 due to the poor instructions, but can only give a 4 or 5 . Used the mill once and liked the way it preformed. Will calibrate a little tighter for a finer crush.
June 25, 2018
6 months ago
Manufacturer said it's not built for pulley stresses, we'll see. Suggested rebuild with 'Pro" parts. So far, I love this mill!
Harbor Freight motor #67839.  Note, mill runs counter-clockwise
grainger parts # 3F380, 3X893, 1L839, and modified 3FJK1.
April 22, 2018
8 months ago
Well worth the money. A very high quality well built mill.
March 22, 2018
8 months ago
Love it. Super fast. Very even grind. Needs better assembly instructions. Good instructions found on youtube.
February 24, 2018
11 months ago
No messing around!
Great mill - used this to replace the smaller 2-roller mill, and once the gap was set, this new 3-roller eats grain like a monster - what took 3-7 minutes to grind before now takes about a minute. Also, efficiency went up 5-8 points (from mid-80's to lower 90's)! Don't skimp on the motor; get a 1/2" drill motor to drive this killer, 3/8" won't cut it.

Definitely worth the money.
February 19, 2018
10 months ago
Worth every penny
I never had a mill before so I can't compare it to others. I'll just say I'm very satisfied with it. The standard 7# hopper easily holds 10# to 11# of grain. You do need a fairly heavy duty drill to drive it and I can't imagine grinding 10# of grain by hand with it.

If I had any complaints, it would be the attachment method of the hopper to the mill. You must entirely remove the roller position locking bolts in order to remove the hopper for mill adjustment. It seems like it would be easy enough to make the holes in the attachment assembly into slots open to the base so simply loosening the bolts slightly would permit removal. But that is very minor issue since once you've achieved the crush you want there is little need to readjust.
January 31, 2018
11 months ago