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3devo_extruder:3devo_extruder [2019/06/04 01:08] – formlab | 3devo_extruder:3devo_extruder [2021/09/30 02:49] – [Troubleshooting] formlab | ||
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====== 3devo Extruder ====== | ====== 3devo Extruder ====== | ||
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+ | [[https:// | ||
+ | |||
+ | ===== Filament width specifications ===== | ||
+ | |||
+ | ±0,1mm deviation is in spec //(± means both + and -)//\\ | ||
+ | |||
+ | Bad: < 2.75mm\\ | ||
+ | In spec: 2.75mm\\ | ||
+ | In spec: 2.85mm\\ | ||
+ | In spec: 2.95mm\\ | ||
+ | Bad: < 2.95mm\\ | ||
+ | |||
+ | ===== Switching materials ===== | ||
+ | |||
+ | * let hopper run enpty for approximately 15 - 20 sec | ||
+ | * add little batches of material each time | ||
+ | * when the extrusion is pure, add more of the material | ||
+ | |||
+ | |||
+ | ===== Shutting down ===== | ||
+ | PLA, HDPE & DevoClean-mid-temp can stay in extruder after shutting down. All other materials need to be flushed out (with purge material, PLA or HDPE) | ||
+ | |||
+ | |||
+ | ===== Dry filament ===== | ||
+ | * 4-6 hours @70-80°C. Stir regularly. | ||
+ | |||
+ | |||
+ | |||
+ | ===== Hydrate filament ===== | ||
+ | * When the filament is too brittle | ||
+ | * Boil water in a large pot. | ||
+ | * Place a test piece of filament into the boiling water with tongs for 6 seconds. | ||
+ | * Allow the filament to dry completely (we recommend at least 24 hours). Do not dry the filament in direct sunlight. | ||
+ | * Test the re-hydrated filament with your 3D printer. | ||
+ | * If filament sizzles when printing, we recommend re-running the process, but only re-hydrate the filament for 2-3 seconds | ||
+ | * If the filament is still too brittle, run the process but re-hydrate for 10-12 seconds. | ||
+ | * Submerge the entire spool in boiling water for the same amount of time which worked for the test piece. | ||
+ | * Allow the spool to dry for at least 24 hours. | ||
+ | * Your filament roll is now hydrated and ready to use again. | ||
+ | |||
+ | Info summarised from [[https:// | ||
+ | |||
+ | |||
+ | |||
+ | ===== Getting consistent extrusion width ===== | ||
+ | Extrusion width is difficult to control. It depends on many factors and there' | ||
+ | This is a simple methodology to get you started. | ||
+ | |||
+ | {{: | ||
+ | |||
+ | * Enter dimensions of spool into the settings panel | ||
+ | * Make a stable environment | ||
+ | * no wind or temperature fluctuations | ||
+ | * Set initial parameters | ||
+ | * All heaters: 10% above the melting temperature (see datasheet of the material) | ||
+ | * Extruder speed: 5rpm. This is a good starting value. Common values are between 3.5 and 6rpm. | ||
+ | * Fan: 50%. Changes to the cooling have a big impact on the filament. | ||
+ | * Apply the settings | ||
+ | * Start logging with [[https:// | ||
+ | * Start extrusion. | ||
+ | * Check for unmelted particles (too cold) | ||
+ | * If filament is too viscous, lower the temperature | ||
+ | * If there are bubbles, the filament needs drying | ||
+ | * Set all heaters to the same temperature. Find out ideal temperature iteratively | ||
+ | * Adjust the temperature in 10 to 30°C steps. Wait 10 minutes for the change to take effect. Patience is key. | ||
+ | * for example: 200°C: too runny --> 170°C: a bit too solid --> 180°C sweet spot | ||
+ | * Check the logs | ||
+ | * When sweet spot is found, set up the **temperature profile** | ||
+ | * Increasing shape: All heaters heat up to increasing temperatures. This causes more compression in the screw due to material being more solid at the beginning. | ||
+ | * Bell shape: the first 3 heaters increase the temperature. The last heater has a lower temperature. | ||
+ | * //It's yet unclear to me how to determine a profile, or why it's necessary instead of using all heaters at the same temperature.// | ||
+ | * If you are dealing with **filament deviation**, | ||
+ | * check if your granulate is pure. Contaminants (a pellet of a different polymer for example) might partially block the flow. | ||
+ | * Purge the machine with DevoClean might make the extrusion more consistent. | ||
+ | * Feed material regularly. Avoid big changes in hopper loading. | ||
+ | |||
+ | Cooling: | ||
+ | * too much cooling makes the filament too rigid. This makes it impossible to control the diameter | ||
+ | |||
+ | Extruder RPM: | ||
+ | * output rate of the material | ||
+ | * If the extruder speed is inconsistent, | ||
+ | * Extruder speed inconsistency can be caused by different things: | ||
+ | * Wrong temperature profile; | ||
+ | * Material feeding issues; | ||
+ | * Material contamination; | ||
+ | * Polymer degradation | ||
+ | * Reducing the Extruder speed gives the puller mechanism more time to react, which results in more stable extrusion | ||
+ | |||
+ | Winder mechanism: | ||
+ | * needs to be easily stoppable with 1 finger (adjust slip clutch on the back). If it pulls too hard, it overrides the control of the puller mechanism. | ||
+ | |||
+ | |||
+ | Source of info | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | |||
+ | |||
+ | ===== Recycling plastic ===== | ||
+ | |||
+ | * keep waste plastic waste away from moisture, UV light, dust or grease | ||
+ | * sort different polymers. Only work with 1 kind at a time | ||
+ | * shred | ||
+ | * dry (if the polymer is hygroscopic) | ||
+ | * extrude | ||
+ | |||
+ | |||
+ | Source: | ||
+ | * [[https:// | ||
+ | |||
+ | |||
+ | ===== Troubleshooting ===== | ||
+ | |||
+ | * **The diameter never settles and is way too big and then too small.** | ||
+ | * **The filament feels rather stiff when handling.** | ||
+ | * **Sometimes blobs of pure pigment appear, throwing off the diameter sensor.** | ||
+ | If this happens with fillers (Plastic pellets with added non-plastic parts, for example Algae powder pigments), **reduce the amount of powder** added to the PLA pellets. I used 25g of Dunaliella Salina for 750g PLA. But this was too concentrated. For every 100g coated PLA pellets, I added 120g clean PLA pellets. Then I mixed them for a few minutes thoroughly with a spoon. The extruded filament is dimensionally stable and feels much more supple when handling. |