Micro Swiss CM2 RepRap (V6) vs E3D V6 Brass Nozzle

Who this comparison is for

This page is for owners of a Prusa MINI or MINI+, or another printer with a V6-style hotend, choosing a replacement 0.4 mm nozzle. We compare the Micro Swiss CM2 RepRap (V6) 1.75 Nozzle, SKU M2902-04, with E3D's V6 1.75mm Brass Nozzle, SKU V6-NOZZLE-175-400. Both listings are a single 0.4 mm nozzle.

If your nozzle might only be clogged, start with clog diagnosis before you buy anything. Prusa says "Changing a relatively new nozzle to resolve a clog is not the solution!" If you're not sure which nozzle system your printer uses, our guide to choosing a replacement nozzle explains the differences. For more printers and nozzles, see the replacement nozzle shortlist, and for filament on the MINI, our Prusa MINI filament page.

How we compared them

This is a research-based comparison. Every detail below comes from Micro Swiss's product and CM2 warranty pages, E3D's product page and V6 nozzle datasheet, and Prusa's Knowledge Base and MINI+ product page, all listed in the sources. Printer fit comes from our compatibility records, which are built from those pages. We haven't printed with either nozzle, so nothing here is a measured result of ours. Where a maker describes its own product, such as "an ideal nozzle for all applications," we label it as the maker's claim.

The two makers publish different kinds of data. E3D gives a maximum temperature, an abrasion-resistance rating, a mass, a flow figure, and hot-tightening and cleaning guides. Micro Swiss gives materials, a hardness figure, a friction coefficient for its coating, and full thread dimensions, and its warranty page sets out which fillers and temperatures the wear warranty covers. Neither publishes a wear test, and Micro Swiss publishes no flow figure, so there's no test-result comparison on this page.

Side-by-side specs

Wear resistance and abrasive filaments

This is the main reason to pick one over the other.

• E3D brass. E3D describes its brass nozzles as for "standard non-abrasive applications," and its datasheet marks every brass V6 size "No" under "Abrasion Resistant?" Prusa says "Brass has excellent heat conductivity and is tough enough to print most common filaments. However, when using abrasive filaments, the brass nozzle tends to wear too quickly." E3D's own listing says it's "Great for everyday printing with PLA, PETG, ABS."
• Micro Swiss CM2. Micro Swiss says the tip "is made of M2 Hardened High Speed Steel," heat-treated to 68 HRC, and backs the nozzle with a "limited lifetime warranty against wear." It calls the CM2 "an ideal nozzle for all applications." That's Micro Swiss's claim. The product page doesn't name abrasive filaments, but the CM2 warranty page linked from it does. It says the warranty "covers wear related to its shape" but not "blockages, jams, or wear to its non-stick coating," and that it's valid "only when used with commercially available filaments that have glass, carbon, or less abrasive fillers." It doesn't cover "highly abrasive materials like Boron Carbide or Tungsten." The warranty "ends once the CM2™ nozzles are discontinued and no longer sold." Micro Swiss publishes no wear test.

Prusa gives examples of what counts as abrasive. It says "Most of the abrasive materials are composites and plastics with additives," and names "ColorFabb XT CF20, ColorFabb Bronzefill, ColorFabb SteelFill, and some glow-in-the-dark filaments," adding "Always ask your filament vendor if you are not sure about filament requirements." Prusa also says that on the MINI, "Unless you print abrasive materials with a brass nozzle, the stock nozzle will last you many hundreds of printing hours."

So, going by the makers: brass is for non-abrasive filaments, and Micro Swiss backs the CM2's shape against wear with glass- and carbon-filled filaments. Micro Swiss's pages don't name metal-filled or glow-in-the-dark filaments, so ask Micro Swiss about those. Neither maker publishes a test that shows how long either lasts with a given filament. Our guide to nozzles for abrasive filaments covers which filaments count as abrasive, and the carbon-fiber filament shortlist lists each spool's own nozzle advice.

Temperature and thermal behaviour

• E3D brass is "Rated to a max temperature of 300°C." E3D says brass, "featuring E3D's signature internal geometry," has "optimal thermal properties for everyday printing, providing smooth layers." Its datasheet lists a maximum volumetric flow rate of 13 mm³/s for the 0.4 mm brass nozzle with PLA at 220 °C.
• Micro Swiss CM2 has no maximum temperature on its product page. Its warranty page says the warranty "doesn't apply if the nozzle is heated beyond 450°C," which is a warranty condition, not a published temperature rating. Micro Swiss says the core "is made of high-temperature Copper Chromium Zirconium," and that "this special alloy retains its strength at much higher temperatures compared to a regular copper alloy." It gives no figure for that and no flow rate.

Prusa notes that hardened steel nozzles behave differently from brass: "A slight disadvantage of the hardened steel nozzle is that some standard materials, like ABS, cannot be printed as fast as a regular nozzle," and "you may have to increase the nozzle temperature when printing," by "about 5°C." Prusa says this about hardened steel nozzles, such as E3D's hardened steel V6. It doesn't mention hardened-tip nozzles like the CM2, which has a copper-alloy body with a steel insert, and Micro Swiss doesn't say whether the CM2 needs a temperature change. So we don't apply Prusa's figure to the CM2.

The printer sets the real limit. Prusa lists a maximum nozzle temperature of 280 °C for the MINI+, so on a MINI+ neither nozzle can be run above 280 °C, whatever it's rated for.

Thread, length, and sizes

Both are M6 threaded nozzles for 1.75 mm filament. Micro Swiss gives the full dimensions: "Threads: M6x1.0," "Thread length: 7.5mm," and "Overall length: 13mm." E3D's product page says "M6 thread compatible with a wide range of printers" and that "V6 nozzles are designed for use with the E3D V6 heater block," but its page text and datasheet text don't state a thread length or overall length. We didn't take dimensions from E3D's drawings, so we don't compare lengths here.

Micro Swiss also sells a CM2 for MK8-style hotends with a 5 mm thread length, compared on our CM2 MK8 vs Creality page. The two CM2 versions aren't the same part, so order the RepRap (V6) version for a V6-style hotend.

E3D sells more brass sizes: undrilled, 0.15, 0.25, 0.30, 0.40, 0.50, 0.60, and 0.80 mm. The undrilled nozzle was sold out when we checked. Micro Swiss sells the CM2 RepRap in 0.4, 0.6, 0.8, and 1.0 mm (SKUs M2902-04 to M2902-10). If you want a fine 0.15 or 0.25 mm nozzle, E3D sells those in brass and Micro Swiss doesn't sell them in the CM2. Our nozzle sizes guide explains the trade-offs.

E3D's datasheet gives a number of dots for each size, three on the 0.40 mm, and Prusa says the dots sit "around the rim of the nozzle." Prusa warns that "the E3D V6 0.25 mm nozzle has no dots, and looks almost the same as the E3D compatible 0.4 mm nozzle that ships with the Original Prusa MINI/+," so keep your spares labelled.

Printer fit

In our compatibility records, both nozzles fit the Prusa MINI and MINI+.

• Prusa says of the MINI: "The printer is compatible with E3D V6 nozzles." Our fit record for the E3D brass nozzle rests on that statement, which names E3D, the nozzle's maker.
• E3D says "1.75mm Brass V6 nozzles are fully compatible with the Prusa 3D printers," and lists "Prusa MK3," "Prusa MK2," and "Prusa Mini" under Printer Compatibility. Its datasheet lists "V6, Lite6, Chimera, Titan Aero, Titan Aqua, Hemera, Prusa MK3, Prusa Mini."
• Micro Swiss says the CM2 RepRap fits "All printers with a E3D V4 / V5 / V6 1.75 Hotend" and the "Prusa i3 MK2 / MK2S / MK3 / Mini," and also lists "Anycubic" and "JGAURORA" without naming models. Our fit record for the CM2 rests on Micro Swiss naming the Mini.

Prusa MK3S and MK3S+. Prusa says "The E3D (or E3D compatible) V6 nozzles fit into the MK3, MK3S, MK3S+," and that the MK3S+ ships with E3D 0.4 mm nozzles. Neither nozzle's product page names the MK3S or MK3S+, and our catalog has no MK3S fit record for either listing, so we don't list it as a confirmed fit on this page. Our MK3S filament page covers Prusa's nozzle guidance for that printer. Prusa also says that for the MMU2S, "we only provide presets for a 0.25 mm, 0.4 mm, or 0.6 mm brass nozzle," and that hardened steel or other alloys "may cause issues."

Nextruder printers. Prusa's Nextruder nozzle article covers the MK4, XL, MK3.9, and CORE One families, which use Prusa Nozzles, not V6 nozzles. Prusa sells a Nextruder V6 Nozzle Adapter that it says "enables your Prusa printer's Nextruder to accept E3D V6 nozzles," but we have no fit record for either nozzle with that adapter, so we make no fit claim for those printers. The other hotends and brands named above aren't in our printer records, so we make no fit claim for them either.

Fitting and cleaning

Both are changed hot. On the MINI, Prusa says to preheat the nozzle to 280 °C, hold the heater block with a 16 mm spanner, unscrew the nozzle with pliers or "preferably a 7mm socket," and tighten the new one "gently, but firmly." It says "There must always be a gap (~0.5 mm) between the nozzle and the heater block," and that you should redo the First Layer Calibration afterwards.

E3D's datasheet gives its own hot-tightening guide for a V6 hotside: for brass, heat to 285°C and wait "roughly a minute," then tighten with "a 7mm spanner and an adjustable wrench," aiming for 2 Nm. Those two documents disagree on the brass temperature. The MINI+ tops out at 280 °C, so on a MINI or MINI+ we follow Prusa's guide. Micro Swiss gives no installation temperature or torque for the CM2.

For cleaning, E3D recommends nylon cleaning filament, warm pulls, cold pulls, and a brass brush for its brass V6 nozzle, and advises against a needle, steel wire brushes, or a blow torch. The CM2 is different: Micro Swiss's warranty page says "Avoid cleaning the CM2™ nozzles with cold pulls or needles. Doing so can damage it and voids the warranty." Micro Swiss doesn't say which cleaning methods it does recommend, so ask Micro Swiss before using a brush or other method on the coated tip.

What each maker says it's for

• Micro Swiss CM2. "An ideal nozzle for all applications," with a hardened tip, a non-stick coating, and a body alloy that "retains its strength at much higher temperatures." That's the maker's claim.
• E3D brass. "Great for everyday printing with PLA, PETG, ABS," with "Anti-ooze internal geometry," for "standard non-abrasive applications."

Micro Swiss

Micro Swiss CM2 RepRap (V6) 1.75 Nozzle (0.4 mm, single nozzle (M2902-04))

Best for

Prusa MINI/MINI+ owners who want a hardened-tip nozzle with a copper body.

Skip this if

You only print non-abrasive filaments and want the cheapest genuine spare.

Verified fit

Prusa Research MINI / MINI+ (stock configuration, per the manufacturer)

Specs, strengths, and limitations

Interface

M6x1.0 thread, 7.5 mm thread length, 13 mm overall length, 1.75 mm filament

Hotend design

Copper chromium zirconium body, electroless nickel plated, M2 hardened high speed steel tip (68 HRC), WS2 nonstick coating

Wear-resistant

Yes, per the manufacturer

Maker notes

Micro Swiss product page: fits all printers with an E3D V4/V5/V6 1.75 hotend and names Prusa i3 MK2 / MK2S / MK3 / Mini. It does not name the MK3S/MK3S+, so only the MINI is recorded. Micro Swiss CM2 warranty page: covers wear related to shape (not blockages, jams or coating wear); valid only with filaments with glass, carbon or less abrasive fillers, not Boron Carbide or Tungsten; void above 450°C or if cleaned with cold pulls or needles; ends when CM2 is discontinued. Prusa Knowledge Base also states the MINI is compatible with E3D V6 nozzles. Amazon listing model M2902 matches the Micro Swiss SKU family (M2902-04 for 0.4 mm). Micro Swiss: made in USA, limited lifetime warranty against wear.

Strengths

• Manufacturer names the Prusa Mini as a fit.
• Manufacturer lists an M2 hardened high speed steel tip heat-treated to 68 HRC with a nonstick WS2 coating.
• Manufacturer states a copper alloy body that keeps its strength at higher temperatures than regular copper.

Limitations

• Micro Swiss does not state a maximum temperature on the product page; its CM2 warranty page voids the warranty above 450°C and if cleaned with cold pulls or needles.
• Swap requires tools and a hot nozzle, plus First Layer Calibration afterwards (Prusa).

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

E3D

E3D V6 Brass Nozzle (1.75 mm filament, 0.4 mm, single nozzle (V6-NOZZLE-175-400))

Best for

Prusa MINI/MINI+ owners who want a genuine like-for-like spare nozzle.

Skip this if

You print carbon-fiber, glass-fiber or glow filaments.

Verified fit

Prusa Research MINI / MINI+ (stock configuration, per the manufacturer)

Specs, strengths, and limitations

Interface

E3D V6 nozzle for the V6 heater block, 1.75 mm filament

Part rated to

300 °C (your printer's own hotend limit may be lower)

Wear-resistant

No

Maker notes

Prusa Knowledge Base (MINI nozzle guide): "The printer is compatible with E3D V6 nozzles." Prusa's E3D V6 Nozzles article lists the MINI/+ hotend. E3D: 1.75 mm brass V6 nozzles are fully compatible with Prusa 3D printers; rated to a max temperature of 300 °C. Prusa MINI guide: change the nozzle hot (preheat to 280 °C), hold the heater block with a 16 mm spanner, leave about a 0.5 mm gap between nozzle and heater block, and redo First Layer Calibration afterwards.

Strengths

• Printer maker Prusa states the MINI/MINI+ is compatible with E3D V6 nozzles.
• Manufacturer states brass gives optimal thermal properties for everyday non-abrasive printing, rated to 300 °C.

Limitations

• Brass is for non-abrasive filaments only (E3D).
• Swap requires tools and a hot nozzle, plus First Layer Calibration afterwards (Prusa).

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Verdict: which should you buy?

For a Prusa MINI or MINI+ that prints only non-abrasive filaments, E3D's brass V6 nozzle is the sensible spare: Prusa names E3D V6 nozzles for the MINI, E3D designs brass for everyday printing and rates it to 300°C, and E3D publishes its flow, cleaning, and tightening data. Micro Swiss's "ideal nozzle for all applications" is the maker's claim, without a published test. If you plan to print carbon-fiber or glass-fiber filaments, the brass nozzle is the wrong tool by E3D's and Prusa's own words. The CM2 is the one of these two that its maker backs for that use, with a 68 HRC hardened tip and a wear warranty that names glass and carbon fillers. Just note that Micro Swiss publishes no temperature rating or wear test for it, and that its warranty rules out cold pulls and needles.

Choose the Micro Swiss CM2 RepRap (V6) if…

• You plan to print carbon-fiber or glass-fiber filaments, which brass isn't meant for and which Micro Swiss's wear warranty covers.
• You want a maker's limited lifetime warranty against wear, and you're fine with its conditions, including no cold pulls or needles.
• You want a 1.0 mm nozzle, a size E3D doesn't sell in brass V6.

Choose the E3D V6 Brass Nozzle if…

• You print PLA, PETG, ABS, and other non-abrasive filaments, which is what E3D designs it for.
• You want a like-for-like spare with a published 300°C rating and published cleaning and tightening guides.
• You want a fine 0.15, 0.25, or 0.30 mm nozzle, or a 0.50 mm, sizes Micro Swiss doesn't sell in the CM2 RepRap.
• You clean your nozzle with cold pulls, which E3D recommends for brass and Micro Swiss says void the CM2's warranty.

Safety and limits

How this page was checked

Every material, hardness, thread, size, temperature, and fit detail above comes from the Micro Swiss, E3D, and Prusa pages in the sources section, retrieved on 2026-10-14, and printer fit comes from our compatibility records. We haven't printed with either nozzle for this page, so nothing here is a measured result of ours. The 300°C rating, the abrasion-resistance rating, the 13 mm³/s flow figure, the ~2.1 g mass, and the hot-tightening and cleaning guides come from E3D's product page and V6 nozzle datasheet. The 280 °C limit comes from Prusa's MINI+ product page. E3D's datasheet says to hot-tighten brass at 285°C and Prusa's MINI guide says to preheat to 280 °C. We follow Prusa for the MINI. The filler conditions, the 450°C warranty limit, and the ban on cold pulls and needles come from Micro Swiss's CM2 warranty page. We found no maximum temperature, flow figure, wear test, or recommended cleaning method on Micro Swiss's pages, and no thread length in E3D's page text. Read more in our editorial standards and affiliate disclosure.

Nozzles: what to check before you buy ↗