Baratza Sette 270 Shim: What It Is and Why People Use It

The Baratza Sette 270 is a great espresso grinder with one quirk that trips people up: the burr alignment. Some units come from the factory with burrs that aren't perfectly parallel, which causes uneven grinding and makes dialing in espresso harder than it should be. The shim fix addresses this, and it's something a lot of Sette 270 owners end up doing at some point.

This covers what shimming actually does, how to tell if your grinder needs it, how the process works, and what you can expect after you're done.

What Is a Shim in the Context of the Sette 270?

A shim is a thin spacer, usually a small piece of metal or plastic tape, that gets placed under one side of the lower burr carrier to level it out relative to the upper burr. The goal is to make the two burrs as parallel to each other as possible.

When burrs are parallel, every coffee particle passing between them experiences the same gap, which means more uniform particle size. When burrs are misaligned (even slightly), particles on one side of the burr get ground finer than particles on the other side. This uneven distribution makes espresso extraction harder to control.

The Sette 270 is a conical burr grinder, which means one burr sits inside the other. The inner (upper) burr rotates; the outer (lower) burr is stationary. Shimming adjusts the lower burr's seating to bring it into better alignment with the rotating upper burr.

How to Tell If Your Sette 270 Needs Shimming

The most reliable test is called the "marker test" or "burr alignment test." Here's how it works:

Take a permanent marker and color the entire cutting face of one burr. Then, without any coffee, hand-turn the grinder through one full rotation at the finest setting with light pressure. Disassemble and look at the marked burr.

If the marker is evenly worn off all the way around, your burrs are well-aligned and you likely don't need to shim. If the marker is worn off on one or two sides but remains intact on others, your burrs are contacting unevenly and shimming can help.

Some people also judge this by taste: if you're getting inconsistent shots that are hard to dial in despite consistent technique, misaligned burrs can be a contributing factor.

Other Signs That Point to Alignment Issues

Inconsistency shot to shot, despite identical settings and technique, is the main indicator. Excessive fines at settings that should be in the espresso range can also point to alignment problems. Neither of these symptoms is definitive on its own, since many variables affect espresso, but they're worth investigating if you've ruled out other causes.

The Shimming Process

The process involves disassembling the lower burr carrier, placing small shims (usually strips of aluminum tape or metal shim stock) under the carrier on the low side, and reassembling to check alignment. Here's a general overview:

Tools and Materials

You need: - Torx T-10 screwdriver (to access the lower burr screws on the Sette 270) - A permanent marker - Shim material: aluminum tape cut into small strips, thin metal shim stock, or even layers of coffee bag foil - Patience

Shim material thickness matters. You're typically working in the 0.05mm to 0.2mm range. Aluminum tape (the kind used for HVAC ducting) cut into small pieces is a common DIY solution. Actual precision shim stock is more accurate if you want to be exact.

Step-by-Step Overview

1. Run the marker test to identify which side of the burr has the gap.
2. Disassemble the lower burr carrier by removing the three screws (Torx T-10).
3. Place a shim strip on the low side of the carrier seating.
4. Reassemble and run the marker test again.
5. Repeat until the marker wears evenly across the full burr face.
6. Do a few test grinds and clean out any shim debris before brewing.

The process can take several iterations. First attempts often go too far or too little, and you'll need to adjust. Most people get it right within 3 to 5 tries.

What to Expect After Shimming

A well-shimmed Sette 270 typically produces noticeably more consistent shots. The particle distribution tightens up, which means better extraction and more predictable shot times.

Don't expect miracles. Shimming addresses alignment, not all grind quality variables. You still need fresh beans, consistent technique, and a well-dialed recipe. But for people who've been frustrated by a Sette 270 that produces good shots sometimes and bad shots other times despite doing everything right, shimming often resolves the problem.

Many Sette 270 owners report that shimming makes their grinder feel like a different, better machine. That's not an exaggeration. The difference between a misaligned and well-aligned burr set is genuinely significant for espresso.

Should You Shim Before Checking Anything Else?

Shimming is a relatively involved process. Before going there, make sure you've: - Calibrated the grinder's zero point properly (the Sette has a calibration procedure in the manual) - Ruled out stale beans or inconsistent dosing as the source of your inconsistency - Confirmed your espresso machine's pressure and temperature are correct

If shots are inconsistent despite all of those being correct, the marker test will tell you quickly whether alignment is the issue.

Shimming vs. Buying a Better Grinder

This question comes up a lot. The Sette 270 is a capable espresso grinder in its price range. Shimming a misaligned unit often brings its performance close to what it should have been from the factory.

If you've shimmed the grinder and you're still unhappy with shot consistency, the next step up in the Baratza lineup is the Sette 270W (with built-in scale) or stepping outside Baratza to something like the Niche Zero or Eureka Mignon Specialita. Our best coffee grinder guide covers the broader market if you're evaluating alternatives.

FAQ

Does the Sette 270 come misaligned from the factory?

Not always. Some units are well-aligned out of the box. The marker test is the only way to know for sure. It's worth doing even on new grinders because the Sette 270 has enough reports of alignment variance that checking is a normal part of setup.

How thick should shims be for the Sette 270?

Start thin. Strips of aluminum tape (roughly 0.05mm to 0.1mm per layer) are a practical starting point. Add layers until the marker test shows even contact. Most alignments are corrected with 1 to 3 layers.

Will shimming void the Baratza warranty?

Technically, disassembly could affect warranty coverage. Baratza's customer support is known for being helpful, and they do offer paid repair services. If your grinder is under warranty and showing alignment issues, contacting Baratza first is worth trying before DIY shimming.

How often does the Sette 270 need to be shimmed?

Once is usually enough. Shims don't move or shift during normal use. You might want to re-check alignment after major drops or disassembly for cleaning, but under normal use, you shim once and leave it.

Bottom Line

Shimming the Baratza Sette 270 is a worthwhile exercise if the marker test shows misalignment. The process takes time but is straightforward with the right tools, and the improvement in shot consistency is real.

Run the marker test first. If your burrs show uneven contact, shimming addresses the root cause. If they're already aligned, the adjustment won't help. Either way, knowing your burr alignment status is useful information for dialing in better espresso.

If the shimming process leads you to evaluate other grinder options, our top coffee grinder guide covers alternatives at similar and higher price points.