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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?
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The 3 rollers and positive feedback from others that purchased.
Robert M on May 22, 2018
appears to be the very best hobby mill available
Neil F on Apr 9, 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 best mill around
Mlle H M on May 8, 2018
One of the best 3 roll mills available
Brian S on Mar 16, 2018

4.9 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
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
2 months ago
Well worth the money. A very high quality well built mill.
March 22, 2018
3 months ago
Love it. Super fast. Very even grind. Needs better assembly instructions. Good instructions found on youtube.
February 24, 2018
5 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
4 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
5 months ago
Best review
Good mill. If you have trouble getting the grain to funnel through, reach up underneath the mill and roll the rollers back and forth from the bottom
January 31, 2018
5 months ago
50lbs of grain without any issues. I did notice the hopper comes with 2 little triangle shaped pieces that fit inside near the rollers to guide the grain, but I think they are for Mills with shorter rollers to push the grain into the center. With the MM3 the rollers are wide enough that these pieces are not needed.
When those were attached I was having jamming issues so I took them out and didn't have any further issues.
Have only used the mill one time, but it worked great and powered through 50lbs of grain easily.
Have only used the mill one time, but it worked great and powered through 50lbs of grain easily.
January 22, 2018
5 months ago
Does What I it to Well
I had been contemplating purchasing a mill for a couple of years. I had always received perfectly milled grain from my normal supplier, Rebel, but alas they are no more. With my replacement supplier, my efficiency declined dramatically. Finally, even when I had asked that the grain be milled finer, it came not milled at all. Thus my hand was forced.

I had been looking at the Monster Mill 3 for some time, but price was pretty dear. I didn't have sufficient incentive to buy it until now. It does a helluva job. I had to buy a new drill to drive it. I'm afraid my 40+ year old B&D just didn't have the torque.

I set the mill at .043. Supposedly the factory setting is .045, but I ran a couple of pounds through it out of the box and it came pretty close to making flour. See the utube videos for making adjustments. At .043 I hit almost 86% efficiency, while my previous normal was 83. I'll probably dial it back to .045 before the next batch.

Putting this together and adjusting it isn't necessarily easy. I bought it with the standard 7 pound hopper and the base. I probably spent a couple of hours all told getting it properly set up and adjusted. Once adjusted and set up, it will run through the hopper load in seconds. I thought I would probably be adding noticeable time to brew prep, but it is negligible.

I'll say I'm not real crazy about the hopper construction and the way it attaches to the mill. As designed and built you can't adjust the mill without removing the hopper. Removing the hopper requires removing the mill adjustment lock bolts and 4 attachment bolts. Kind of a PITA. The hopper is 4 pieces (well, actually 6 but two are small end pieces) of sheet metal. There are a lot of machine screws, washers and locking nuts. If the hopper were two or 4 pieces there could be a lot fewer fasteners. I assume the design is to be more shipping friendly.

I can't speak to how this mill compares to others, but it seemed like the best in class when I started looking and still seemed so, so I bought it. I'm very satisfied so far. Morebeer had the best price by a significant factor when I was looking. Shipping was fast and it arrived in fine shape.

So, if you can afford it/justify the price, and you are reasonably handy, buy it. I don't think you'll be disappointed.
September 4, 2017
Monster Mill-Complete 3 Roller Package
Awesome product! Well built sturdy and strong, mills grain very well for improved brewing efficiency. Although, it can jam up if you don't spin the rollers before filling the hopper or you initially dump grain in too fast. Not a big deal, just dump the grain out of the hopper and slowly pour it again to "prime" and then refill the hopper as it's milling.
June 6, 2017