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  • PrintDry Filament Dryer

    PrintDry

    New product

    10 Items

    149,00 €tax excl.
    180,29 €tax incl.

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    Filament dryer to remove moisture from all types of filaments in 3D printing.

    Every user of a 3D printer knows the importance of keeping the filament free of moisture, as it is a source of common problems. Detecting the problem of humidity is simple, since the finish of the piece that is printed is soft and with many pores, in addition, during the printing you can hear mini explosions, produced by the sudden evaporation of the water inside the filament at the exit of the extruder. This water can oxidize certain elements of the extruder, such as hardened steel nozzles.

    Image 1: Problems of nylons with moisture

    Many users try to dry the filaments in a homemade oven, with the dangers that this entails, in addition, with the little uniformity of process because these ovens are not usually able to keep the temperature stable at such low values (30 - 70 ºC) , instability that in some cases can cause a problem more than a solution. For this reason Printdry II comes to solve a problem in 3D printing, especially to users who use technical filaments, where every little detail counts in the final quality of the pieces.

    printdryii

    Image 2: PrintDry II filament dryer with extra tray. Source: PrintDry

    The hygroscopic filaments are prone to absorb water to a great extent, since the water molecules are attached to the polymer molecules, forming strong intermolecular bonds. Certain materials, such as the Nylonstend to gain a lot of moisture in a short time and need to be dried by applying heat on them, due to the difficulty of breaking the intermolecular bonds so strong that they form them. In this case, the use of desiccants is not sufficiently effective, since they saturate before getting enough to reduce the moisture values of the filament (less than 20%).

    To solve the problem of humidity, it is recommended to use the PrintDry filament dryer, a device capable of breaking the intermolecular bonds between water and polymer thanks to the following drying parameters.

    Image 3: PrintDry II features. Source: PrintDry.

    Thanks to their design, the filament coils are placed in parallel in two drying chambers; allowing to dry two coils up to 200 mm in diameter.

    In addition, it allows other options, which are implemented through two Kits:

    • Extra tray (smaill coils): With the extra tray kit, a tray is placed on the initial drying axis, creating a new drying chamber. In this way, three small size filaments can be dried at the same time.
    • Extra kit (large coils): By using the large coil kit, you can dry coils between 2 and 5 Kg, with an outer diameter of up to 300 mm.

    The PrintDry II features a digital display with 5 preset options where the temperature can be easily adjusted. In addition, it has an integrated timer, so you can configure the necessary drying time for each material.

    Image 4: Display PrintDry II. Source: PrintDry.

    To understand how the PrintDry II works, we must talk about the following parameters:

    Drying temperature

    The molecules that form the filament are agitated as a function of the temperature increase to the point that the union of the intermolecular bonds between water and polymer weakens. Once the break is produced, the water molecules are released to the outside of the filament and from there to the air that is in contact with it. This air is at an elevated temperature (up to 70 °C) and with a low moisture content, thanks to the PrintDry filament dryer itself, improving and speeding up the drying process. In view of this, one should not be tempted to use the maximum temperature of the PrintDry filament dryer to dry all the filaments, since thermal degradation and / or oxidation of the filament may occur. Below is a table with the recommended temperatures and times for each material:

    MaterialDryer TemperatureDrying Time
    PLA 45 ºC > 4h
    ABS 60 ºC > 2h
    PETG 65 ºC > 2h
    Nylon 70 ºC > 12h
    Dessicant 65 ºC > 3h
    PVA 45 ºC > 4h
    TPU /TPE 50 ºC > 4h
    ASA 60 ºC > 4h
    PP 55 ºC > 6h
    Table 1: Drying time and temperature according to the material

    The actual temperature inside the PrintDry II may vary due to the ambient temperature, the location of the machine and the amount of filament or desiccant bags that are introduced inside. If the ambient temperature is high, this will affect a higher temperature inside the PrintDry II. In relation to the PrintDry II chambers, when the extra tray is used (creating an additional drying chamber) the lower chamber can have a temperature up to 8º C higher than the upper drying chamber. Also, the more material inside the PrintDry II, the higher the temperature.

    Drying times

    As it is clearly seen in the previous table, the filaments do not dry instantly. The first step is for the heat to penetrate the entire filament including the one inside the reel. Once all the material is at the optimum temperature, you should wait for some time so that the water concentrated inside the filament is positioned on the walls and then evaporated into the air. Wait for the time recommended in the table above is key to always obtain the maximum properties of the materials. In addition, to ensure that the moisture of the filament is the right one, a digital humidity meter can be used, introducing it inside the filament dryer, right next to the material that is drying. Continuing with the drying times, the use of the PrintDry filament dryer is not recommended for more than 40 consecutive hours, being necessary to disconnect until it cools.

    Difference in humidity concentration

    This term is the concentration of moisture in the filament compared to that of the air that surrounds it. The contact of the filament with dry air (low dew point) facilitates the transfer of water to the air quickly and effectively.

    Air flow 

    The PrintDry II filament dryer obtains a natural air current by the simple effect of heating the air, it weighs less, rises, absorbs moisture, cools and descends. This process is repeated cyclically, generating a current of air that increases the drying power of the filament.

    At a molecular level what happens since a filament is with a high percentage of moisture until the time after drying is summarized in four stages:

    Stage 1: Once the filament absorbs moisture from the air, the water molecules bind strongly to the polymer chain that forms the filament, giving intermolecular bonds.

    Stage 2: The heat loosens the bonds between the moisture and the polymer chain, allowing the water molecules to move freely through the filament.

    Stage 3: Thanks to the low percentage of humidity in the circulating air, the water molecules concentrated inside the filament move towards the surface, where they are dragged by the dry air.

    Stage 4: After drying the filament long enough, the water content is significantly reduced (up to 10%), which ensures a quality 3D printing.

    Once the percentage of humidity has been reduced to a minimum, it is advisable to store the filament in a storage box (PolyBox) or to store the material in an airtight manner. For this PrintDry II has a being of 5 containers of hermetic and vacuum sealing, ensuring long storage intervals without disturbing the low percentage of humidity.

    Humidity test

    Image 4: Humidity test. Source: PrintDry

    Apart from following the indications of drying of PrintDry, it is recommended to use a temperature and humidity meter inside the filament dryer to ensure that the working temperature is correct until the humidity is reduced to the maximum.

    The time of continuous use should not exceed 40 hours, and the dryer should be disconnected for a sufficient time until it cools down to room temperature.

    The PrintDry filament dryer is compatible with any type of 3D printer FFF / FDM, with any material, regardless of diameter (1.75 mm or 2.85/3 mm).

    Manufacturer PrintDry
    Work temperature 35 - 70 ºC
    Maximum drying time 40 hours continuous
    Power supply 220 - 240 VAC, 60 Hz (245 W)
    Dimensions 370 x 370 x 360 mm
    Weight 3.8 kg
    HS Code 8516.8
    Content 1 x PrintDry
    1 x Feeder for the top chamber
    1 x Container and vacuum pump

     

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