---
title: MMD - Meter Mix Dispense
slug: process/mmd-meter-mix-dispense
description: Discover the advantages of MMD (Meter, Mix & Dispense) technology for optimal mixing and dispensing of Carbon's two-component bulk resins. This equipment ensures precision, accuracy, and efficiency—minimizing waste and production downtime.
docTags: 
createdAt: 2024-07-04T01:06:39.234Z
---

MMD stands for **Meter, Mix, and Dispense**. MMD equipment is specialized machinery used to precisely mix and dispense multi-component materials. MMDs are a perfect fit for Carbon's two-component bulk resins.

MMDs ensures high-quality, repeatable results while reducing material waste and production downtime, making it an essential tool for applications requiring precision and reliability. 

Key features of MMD equipment:

- **Metering Accuracy**: Precisely meters each component to control flow rate and minimize waste.
- **Mixing Precision**: Ensures components are mixed at the correct ratio
- **Dispensing Systems**: Delivers mixed material with precision.
- **Material Compatibility**: Designed to handle a range of material viscosities, from thin liquids to highly viscous pastes.
- **Automation Capabilities**: Often integrated with production lines for automated dispensing, improving efficiency and repeatability.

# Validated MMDs

## Meter Mix PAR 3CM

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Carbon has validated the Meter Mix PAR 3CM for applicable resins **when noted on the material protocol sheet**.

Reference [Meter Mix PAR 3CM](docId\:RO9oMdZmwxQpwOHukmhY2) for more information.

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Other MMDs by [Meter Mix](https://www.meter-mix.com/) may also be used when noted on a material protocol sheet.

Updated versions of noted models are also viable.
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![Meter Mix PAR 3CM](https://api.archbee.com/api/optimize/xcOI3p6O5jO0MVhoHv9rO-UvYLjQQHfFmdfteRnqu8W-20240813-091115.png)
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## Loctite EQ MM38 MMD

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The Loctite EQ MM38 MMD is a **legacy** recommendation for certain resins, when noted the material protocol sheet.

Reference [Loctite EQ MM38](docId\:bHVQtpFmMs95TRfnr4KvP) for more information if you still use this MMD.


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::Image[]{src="https://api.archbee.com/api/optimize/3CesIL2dYMCHPZvRjp8S0/fVewg8giJ3yZSD8Z12qld_carbon-mmd-white.png" size="76" width="790" height="1000" position="center" alt="Loctite EQ MM38 MMD" showCaption="false"}
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# Clearing Resin from MMD Lines

Following this purging procedure is best practice when using a Carbon resin when

- Preparing for a shutdown
- Changing Resins
- Clearing a clogged line

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Confirm this process and solvent compatibility with your MMD's manufacturer before proceeding.
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### Solvents

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**99% IPA **(Isopropanol)

::Image[]{src="https://res.cloudinary.com/carbon3d/image/upload/t_auto_quality_format/Education/Process/Resin%20Mixing%20and%20Dispensing/MMD/IPA-1-gal-bottle_transparent.png" size="60" width="632" height="914" position="center" alt="IPA bottle" showCaption="false"}
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**99% PEG-400** (Polyethylene Glycol)

::Image[]{src="https://res.cloudinary.com/carbon3d/image/upload/t_auto_quality_format/Education/Process/Resin%20Mixing%20and%20Dispensing/MMD/PEG-400.png" size="48" width="527" height="890" position="center" alt="PEG-400 bottle" showCaption="false"}
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### Procedure

The goal is to purge the MMD tank and lines until no more resin comes out of the lines.
This procedure may be used for either Part A or Part B.

- Add IPA into the tank (example: 2 L at a time)
- Purge the MMD, and add more IPA as needed, until the IPA coming out is clear
- Add PEG-400 into the tank (example: 2 L at a time)
  - PEG-400 is an inert, higher viscosity liquid, which is helpful for "pushing" trapped resin out of the lines.
- Purge the MMD, and add more PEG-400 as needed, until the PEG-400 coming out is clear
- Repeat the purging with IPA again to remove residual PEG-400
- Add resin into the tank
- Purge the MMD, and add more resin as needed, until the resin coming out is smooth, with no residual IPA or PEG 400
- Proceed to standard production