How to prevent 3D printing filament from moisture absorption By EIBOS
Whether you are 3D printing amateurs or professors, you must have encountered the problem of moisture absorption of filaments. Take one roll of nylon material for example, when it exposes to the air for one week, it will reach the saturated water absorptivity. Even in those areas with humid weather, filament moisture absorption rate can increase to 3 times or more in 1 to 3 days.
In fact, all FDM filaments are hygroscopic, including but not limited on ABS, PLA, Nylon and others. It is quite strange to name it as hygroscopicity. The better way to describe this situation is that filament likes absorbing water molecular. This water molecular absorption feature could destroy 3D printing filament heavily. The molecular weight of filament will decrease because of moisture absorption, which will render the material fragile. What’s more, when the damp filament working under high temperature, the vast water molecules inside will become boiled, which will also cause noise. Then, a large number of bubbles will appear on the surface of the final product, which will result in some problems like messy, rough and whitish on the surface.
Damp filament and dryed filament comparison
Reduce the heating temperature and speed-up the printing process could be a good way to solve the bubble problem, but because of the low temperature, the mobility of the filament will decrease, which will cause choke problem easily. Also, the viscosity between the printed layers will decrease.
There are two normal methods to prevent moisture absorption today. The first one is using desiccant to reduce the humidity inside the storage box to dry the filament. The disadvantage of this method is time-consuming. Another way is using PI heating pads to heat-up the filament. But it can’t always be dried evenly and reach the target temperature.
Different filament dryers comparison
EIBOS launched a new filament dryer named CYCLOPES recently. In order to research the drying effect, EIBOS laboratory tested the drying curve of the water molecules content of carbon fibre nylon and PLA material.
Obviously, the moisture content of filament can be reduced significantly through EIBOS filament dryer.
EIBOS not only launched the filament dryer to solve the damp filaments, but also launched another product filament vacuum pump, named EURUS, to prevent filaments from moisture absorption. EURUS can repack the dried filament in a vacuum bag. These two products will crowdfunding on Kickstarter at 24/09/2020.
More information about this company and the Kickstarter program is on their official website EIBOS, you can also enter your email to subscribe updated product information.
The topic of 3D printing has gathered more attention in the media over the past couple of months as printers all around the world attempt to alleviate the burden on national governments by printing PPE to be used in the fight against the Covid-19 pandemic.