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Verdampfer & Coils

Microcoil winding - instructions, wire thicknesses and ohm values

Wrapping microcoils like a pro: instructions with wire gauge, turns and ohm values. Plus tips on wattage, material and safe installation in the self-winding RTA.

A microcoil is a particularly tightly wound heating coil for rebuildable atomisers, delivering dense vapour, a clean flavour and even heat distribution. Because the individual turns lie directly against one another, the characteristic ‘glow’ spreads from the centre outwards – a sign of a clean build. This guide explains what makes a microcoil, how to build one, which wire gauges and resistance values are suitable, and what you need to bear in mind when installing it. The following microcoil guide is aimed at adult vapers aged 18 and over with some basic knowledge of mods and rebuildable atomisers.

A microcoil is a heating coil whose windings lie directly on top of one another without any gaps – hence the name ‘tight coil’ or ‘contact coil’. The wire is typically Kanthal A1, Ni80 or stainless steel (SS316L) with a diameter of 0.3 to 0.5 mm. It is usually wound around a mandrel of 2.0 to 3.0 mm. The result is a compact coil with 5 to 8 turns and a resistance of between 0.4 and 1.2 ohms – depending on the material, wire gauge and number of turns.

Unlike spaced coils (with gaps between the turns) or more complex builds such as Clapton and Fused Clapton coils, the microcoil is the purist’s choice. It is easy to build, requires no special tools and is therefore particularly suitable for beginners in the world of custom coil building. At the same time, it remains the benchmark coil in many MTL and restricted DL vapes because it heats up quickly and delivers a very precise flavour profile.

To build a Micro Coil, you’ll need coil wire, a coil jig or screwdriver, precision scissors or side cutters, ceramic tweezers, cotton wool and, of course, your rebuildable atomiser.

Preparation and winding

  1. Wind 5–7 tight turns around a 2.5 mm mandrel. Keep the wire under slight tension so that the turns lie neatly next to each other.
  2. Position the coil centrally between the posts, tighten the screws and trim the wire ends flush.
  3. Measure the resistance on the mod or with an ohmmeter. Typical values: 0.8 ohms with 0.4 mm Kanthal and 6 wraps around a 2.5 mm mandrel.

Glowing, tightening and wicking

Pulse the coil briefly at low power (20–30 W) until it glows evenly from the centre outwards. Use the ceramic tweezers to press the coils together whilst pulsing again – this creates a tight coil without hotspots. Then insert cotton, soak it with e-liquid, and close the chimney.

  • Wire material suitable for the mode: Kanthal and Ni80 only in wattage mode. For temperature control, you need Ni200, titanium or SS316L.
  • Resistance and battery safety: Dual microcoils under 0.2 ohms require a mechanical or regulated mod that safely delivers the current. Always calculate using Ohm’s law and check the CDR of your 18650/21700 cells.
  • Coil diameter to chimney opening: A coil that is too large blocks the airflow; one that is too small allows the cotton to dry out. Use the inner diameter of the chimney as a guide.
  • Use the right amount of cotton: too much cotton blocks the airflow, too little leads to dry hits. The cotton should be able to be pulled through the coil with slight resistance.
  • Increase the power gradually: Start 5–10 W below the recommended value and work your way up to the sweet spot.

A common mistake: the coils aren’t compressed properly. This creates hotspots that burn the coil unevenly and spoil the flavour and aroma. Take your time with the burn-in – this is the most important step.

What resistance value is suitable for a microcoil?

For MTL vaping, 0.8 to 1.2 ohms is a good range; for restricted DL, around 0.4 to 0.6 ohms. The value depends on the wire diameter, the number of turns and the core size.

How many turns does a microcoil need?

5 to 7 wraps are standard. More wraps increase the resistance and heat-up time; fewer wraps reduce both. Experiment with a coil calculator before you start winding.

Can I also build a microcoil as a dual coil?

Yes, two microcoils connected in parallel halve the resistance and double the vapour production. However, this only works in atomisers with two deck positions and suitable airflow.

How long does a microcoil last?

Depending on the e-liquid and usage, 1 to 3 weeks. Sweet e-liquids with a high sugar content significantly shorten the lifespan, whilst neutral bases extend it.

A neatly wound microcoil is the foundation for precise flavour and consistent vapour – whether in an MTL RTA or a restricted DL setup. With the right wire gauge, the appropriate mandrel and careful annealing, you’ll achieve consistent results. If you prefer ready-made solutions or want to try out different materials, you’ll find suitable options in our selection of coils and build wire. For a complete DIY build, it’s also worth taking a look at the atomiser category.

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