Printing with engineering materials has these common problems:
The state of AMS desiccant:
When printing carbon fiber-reinforced engineering materials like PA-CF and PAHT-CF, do not use a 0.2 mm nozzle, otherwise, the probability of clogging will be very high. When the diameter is increased from 0.4 mm to 0.6 mm and then to 0.8 mm, the printing fineness decreases in turn, but the clogging probability also decreases in order, so the 0.6 mm nozzle is recommended as the first choice, and the 0.4 mm nozzle is the second choice (the recommended layer height is between 0.15 and 0.3 mm, and the maximum printing speed should be about 100 mm/s). Before using these materials, it is recommended to set the nozzle temperature to 280 °C, and then use an Allen key and a needle to clean the inside of the nozzle to reduce the risk of clogging during the printing process.
Do the same if the nozzle gets clogged during printing, and make sure the inside of the nozzle is clean before the next printing. If the nozzle is clogged, please refer to Nozzle clogs | Bambu Lab Wiki to clean it.
When the time of printing each layer is too long, these materials' Z direction bonding will get weak and the small models will be no longer strong(the previous layer has been over-cooled). So, when you need to print many small models, you should assemble them into different groups and print by object(default setting is by layer), and maybe on different plates, rather than put them on the same plate and print by layer.
4. To strengthen your models printed with PA-CF or other CF or GF reinforced engineering filaments, you'd better get them annealed at above 80 °C for 8 hours after printing. And the best annealing temperature of Bambu PA-CF, PET-CF, and PAHT-CF is 120 to 130 ℃ (5~8 hours). After that, the comprehensive mechanical properties can be improved by about 10% to 20%(the data is obtained from the standard specimens, depending on the temperature, time, and the model itself: size, structure, infill, and other printing settings).
5. Note that when drying filaments and annealing printed models, it is recommended to use devices at uniform temperatures, such as Blast drying oven, and do not use microwave ovens or household ovens. Avoid obvious force or uneven heating (away from the oven heating area), so as to avoid damage to the filament, spool, or model due to local overload and overtemperature.
1. Generally, the higher the infill density is, the greater the strength and material consumption will be. To keep a balance between strength and material consumption, the Strength Presetting(6 Wall loops and 25% infill density) is highly suggested when printing big models that are expected to withstand high loads. Of course, if you can accept more material consumption, you can manually set a higher infill density for greater strength.
2. If the model size is large and the infill rate is set high, e.g. 60% (default is 15%), and warping occurs at the bottom of the model, you can adjust the infill rate appropriately. In addition, the infill pattern with more straight lines is more likely to cause shrinkage, you can change the infill pattern to spiral to reduce the risk of shrinkage. For some structural parts with high strength requirements, you can set 5 loops of walls and 25% infill rate, and try to avoid using more than 50% infill rate to reduce the tendency of shrinkage; for most non-structural parts with low strength requirements, you can directly choose the default 2 loops of walls and 15% infill rate. You may refer to: