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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Browse 9 questions Browse 9 questions and 89 answers
Why did you choose this?
MoreFlavor Store
domestic product
Shawn H on Nov 18, 2021
Good reviews and had a couple people recommend it
Christopher B on Aug 10, 2021
domestic product
Shawn H on Nov 18, 2021
Craft Beer and brewing review
Richard C on Oct 13, 2021
Good reviews and had a couple people recommend it
Christopher B on Aug 10, 2021
I have read great reviews about this product.
daniel john e on Jun 16, 2021
beer brew
Sebrina Maria A on May 15, 2021
requested gift purchase
Mary Elizabeth M on Apr 29, 2021
Previous Mill only lasted a year, this should be less expensive in the long run
Jacob S on Apr 28, 2021
upgrade from 15 year old barley crusher, which had turned into a BARELY crusher
Cliff H on Apr 22, 2021
Increase efficiency with BIAB going with MM3 after reviewing many options
Todd R on Apr 22, 2021
I want to mill my grain just before being
Jason H on Apr 21, 2021
Gary R on Apr 9, 2021
Best reviews
Will B on Mar 16, 2021
Milling dried seafood
John H on Feb 27, 2021
Good reputation. Looking to upgrade, and want something reliable.
Eric B on Feb 23, 2021
Based on online reviews and friend reviews.
Ron C on Feb 13, 2021
Reviews and reputation.
Ron D on Jan 16, 2021
Good Reviews, American Made
Jason Van H on Jan 13, 2021
For the 3 Rollers
Marco V on Dec 3, 2020
Wanted for all grain brewing
Robert W on Nov 14, 2020
Valued C on Oct 11, 2020
rachel r on Aug 8, 2020
David R on Jul 20, 2020
Made in the USA
Todd R on Jul 3, 2020
Has great reviews. My Barley Mill seizes up
David W on Jun 24, 2020
I have been using my cereal killer for a few years but the rollers have worn out and I need a new mill.
Craig S on Jun 24, 2020
My Barley Crusher was having issues and their support wouldn't answer me. Plus a 3 roller mill gets better efficiency!
Bronson B on Jun 15, 2020
David Heath recommended it
Mark B on Jun 8, 2020
Make my brews more consistent
Jason Gonzales on May 29, 2020
Looking to start going bulk with the flagship homebrews
Scott Christensen on May 11, 2020
Just because
brian w on May 6, 2020
3 rollers is superior, and I need to crush my own grain during the pandemic
Paul E on Apr 21, 2020
Made in USA
Dustin M on Apr 11, 2020
Need to crush hulls on BuckWheat want to grow it. And now will make some beer too! Kinda exciting
Thomas C on Apr 10, 2020
Looking for better quality crush
Michael Ferguson on Mar 27, 2020
High quality mill, good reviews from others i know who own one
Tim C on Mar 10, 2020
Better crush and done in one pass. Have seen this one in action and very impressed.
Donald J P on Jan 29, 2020
Replacing an old 2 roller Barley Crusher!
RYAN H on Jan 16, 2020
Need a new mill
Alex M. on Jan 10, 2020
Advertised durability
Jan on Jan 3, 2020
The posted reviews gave this high ratings and more importantly I was ready to move up from my Phil's Mill I purchased in the late 90's
Jim C on Nov 16, 2019
I brew a lot and wore out my grain crusher. Time to step into something that will last. Toss me some stickers for my brew gear room.
Bryon V on Nov 16, 2019
why not
Rory O on Oct 12, 2019
Recommendation from a friend
MJ C on Sep 21, 2019
Because my brewmaster told me to
Ryan R on Aug 31, 2019
Good reviews
Joseph H on Aug 28, 2019
3 bbl brewery - need higher end mill. DIY capable to motorize it ourselves.
The price combined with the hopper extension. I'm not using this for beer production. Plan to grind grains for mushroom growth.
Jeremey W on Jul 13, 2019
Adjustable rollers
Yvan B on Jul 9, 2019
need better one
John White on Jul 6, 2019
Base on your site’s recommendations and the 3 roller feature
Craft Beer and brewing review
Richard C on Oct 13, 2021
I have read great reviews about this product.
daniel john e on Jun 16, 2021
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: I wish I could answer that for you but I've had trouble getting the shaft coupler to stop slipping ever since I got it and when I reached out to Brewmaster they were no help. The motor sure seems good in concept but I have trouble figuring out how it's compatible with anything so far :/ that said the mail I attempted to hook into is a three Roller Mill but not a monster brand, again my concern would be with a design in general not so much which Mill it should be connected to
How tall is the assembly with the extension?
Daniel Clark on May 6, 2020
BEST ANSWER: From very bottom of included wood board plate to top of stock hopper is 14 inches tall, and from very bottom of the base to top of the extension is 23 inches, so the extension adds 9 inches, cheers
Can this mill down to flour size?
Roy Baker on Apr 22, 2020
BEST ANSWER: This mill cannot be adjusted tight enough to pulverize grain into flour. Even if you ran it a few times it would still be very coarse.
Is the drive shaft round, or indexed to provide a better grip on the chuck of a drill?
Herbert Pokorny on Jun 30, 2020
BEST ANSWER: "3/8 inch integral drive shaft w/3 flats for drill driving, 2" long outside of frame" Yes there are 3 flat spots on the drive shaft, drill chuck works well.
What are the dimensions of the wood board? I would like to be able to set this on top of my 30G mash tun.
Daniel Clark on May 6, 2020
BEST ANSWER: 12” square the mill sits on the left edge of the board you could easily make it any size you want just trace the pattern on the wood just need a drill and jigsaw the mill is 3” wide and 7” across
What is the capacity without the hopper extension?
JEFF M on Oct 4, 2018
BEST ANSWER: 11lbs. Awesome Mill too, never had any issues
I can't figure out how to set the rotation speed on my new Monster Mill. Monster Mill recommends running the mill at 150 to 250 RPM. How am I supposed to check that? I'm thinking to try an iPhone flash metronome. Anybody solved this problem?
Doug Slakey on Feb 10, 2021
BEST ANSWER: If you're using a power drill or similar, I don't have any good answers, other than 180rpm = 3rps, so that's the speed of 60bpm triplets, if you're a musician.

A lot of us just buy a 180rpm motor to attach, and then we just know it's the right speed. This also solves for having to attach anything every time. MoreBeer has the Malt Muncher; others carry similar products. Don't forget you'll need bushings. The MM has helpful pix and customer questions/answers about how to connect it up.

NOTE: for grain milling, slower is better, but slower is also slower. So, while it'd be ok to grind your grain at, say, 90rpm, it'd takes 2x as long as at 180.
What are the dimensions of the base rollers? I'm retiring my Captain Crush mill and would like to adapt my hopper to MM3. Cheers!
Dick Rogers on May 27, 2020
BEST ANSWER: The rollers themselves on this mill are 1 1/2", I imagine you're more interested in the dimensions of the roller housing for adapting a hopper though. They are 3 1/2" wide, 7" deep, and 3 3/8" tall.

4.7 / 5.0
39 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 3 out of 5
Good mill on a poor base
The mill is great. It does exactly what a mill is supposed to do. The grains are crushed to the proper size and the husk is left mostly intact.

Assembly was easy, except for the two in the bottom/center of the hopper, which requires a stubby screwdriver and an open-end wrench.

The base is terrible.
* The holes in it leave a LOT of play for the rollers. The alignment holes for the end pieces should either be good enough to leave the rollers with only a few thousandths of endplay or they should be slotted.
* It's easily deformed by the bolts.
* It will absorb moisture from the air, becoming even more fragile as it ages.

This base needs to be replaced with a thick/tough plastic.
September 26, 2021
Rated 5 out of 5
Motorized Monster!
I’ve only used it a couple of times but so far it’s amazing. It chews through wheat malt (and you know that I’m talking about here) like nothing.
Motorized Monster Mill 1
And 2
July 14, 2021
7 months ago
Rated 5 out of 5
A Beast!
Just got this mill and hopper extension a few days back. Putting the hopper together took some time as the nuts and bolts are very small. Couldn’t tell if the nuts were supposed to be on the inside or outside of the hopper, but opted for outside in order to avoid grain getting caught on top of the nuts if they were on the inside. Adjusting the roller was a pain, but once you set it and get an acceptable crush, you really shouldn’t have to adjust again. Used feeler gauges to get gap to .040” and ran about a pound of grain thru. Crush looked good. Used a sharpie to Mark the .040” mark on the adjustment knob. Tightened the mill to the base and the rollers wouldn’t roll as freely. Loosened the bolts a bit (still tight enough) and the rollers were free again. Wish the base has some way of being secured to the bucket, although I doubt it would ever slip off. Lastly, was surprised that the drive shaft was 3/8” as the manufacturer’s standard size is 1/2”. Guess I didn’t read the fine print. Not a huge deal as I plan on using a drill at least for now. I suppose I could replace the roller and bushings with 1/2” in the future if I ever decide to add a motor. Overall, glad I spent the money on a mill that should last for a very long time. Cheers!
.040” Milled grain
Mill Setup
May 10, 2021
8 months ago
Rated 5 out of 5
A great mill!!
In a long learning process, this is the third mill I have bought from MoreBeer - I kept trying mills until I had one that worked well. Monster Mill (3 roller version) is the third. I just finished assembling my new mill and I am very impressed with the build quality - by far the best build and best materials of any of the mills that have passed through the brewery. The frame (side plates) are made from a thick slab of aluminum, the rollers are heavy and wider than in other mills I have owned. The hopper is a heavy gage of steel sheet with galvanizing. It is by far the best, sturdiest hopper of the mills I have tried. See photo 1.

Gapping the rollers does involve removing the hopper - this mean you have to remove four bolts and the two set screws. It takes a minute or so each way. Gapping the rollers does require some finesse but I plan to set it (for BIAB) and leave it alone for the next decade or so.

I plan to set the mill on a 6 gallon pail. To hold the mill in place on the bucket, I added 4 @ 1/2" pegs at the corners of the base slab, extending about 1" below the bottom of the base (see photo 2).

I ran a few pounds of malt through the mill, as described in the assembly instructions. I used my 3/8" battery-powered drill, which seemed to handle the load fairly well. Long term, I plan to buy a corded 3/8" variable speed drill and leave this new drill attached to the mill.

One thing I can't figure out is how to set the rotation speed. Monster Mill recommends running the mill at 150 to 250 RPM. How am I supposed to check that? I'm thinking to try an iPhone flash metronome. Anybody solved this problem?

One thing - the drill handle kicks back pretty hard when you dump the malt into the hopper. I added a board on the top of the mill base to rest the drill handle on (see photos) so I don't have my wrist twisted so hard.

Long term, I plan to screw the support board to the base and add a tie to the drill trigger, plugging the drill into a switched circuit. That way, I can set up the mill, switch on the drill, then dump in the malt with two hands.

I want to give a well-earned shout out to MoreBeer who have stood behind their products to an amazing degree! It's my #1 choice for beer gear, knowing that if I have a problem, they will take care of it.
New mill on a 6 gal pail, with 3/8" drill.
Pegs centering the mill on the pail.
February 10, 2021
11 months ago
Rated 4 out of 5
Great Mill
Works as expected and it is high quality, only downside is that it is a pain to adjust the gap.
February 3, 2021
1 year ago
Rated 4 out of 5
Had a two roller grinder and it worked well at first but then not so much towards the end
Purchased a three roller grinder and have been grinding grain in half the time. Great product for a reasonable cost
January 9, 2021
1 year ago
Rated 4 out of 5
Works phenomenally. Biggest downside I see is the pain it is to adjust the gap. I use a feeler gauge, and you have to take the cover off to adjust it. Only downside I see so far. Major upgrade from my Barley crusher. Would score it 4.5 stars.
January 4, 2021
1 year ago
Rated 5 out of 5
Replaced a 5 year old barley crusher. No comparison. This thing is a beast
November 2, 2020
1 year ago
Rated 3 out of 5
The package was missing a bolt and I have still been unable to get another one sent to me.
October 20, 2020
1 year ago
Rated 5 out of 5
Great mill, though it'd be nice for the price to come with a file or two to set the gap. Also, I'd recommend a drill that's corded, because my ryobi cordless has to work pretty hard.
October 20, 2020
1 year ago