What is 3D DLP printing?5 answers3D DLP printing is a digital fabrication technology that uses a process called digital light processing (DLP) to create physical objects layer by layer. It involves the use of a photopolymerizable resin that is cured using UV light or photo absorbers, resulting in complex 3D structures. The resin can be adjusted by adding fillers such as bioceramic powders or gold nanorods to enhance the properties of the printed structures. The printed constructs can be hardened using a curing bath or heat treatment, eliminating the need for post-processing sintering. DLP printing has applications in various fields, including bone-regeneration, medical devices, and manufacturing industries. It offers the advantages of high precision, customization, and the ability to print objects directly from a computer-aided design (CAD) model.
What is Document Printing system?4 answersA document printing system is a system that allows for the printing of documents using various methods and technologies. It typically includes an image forming apparatus, an electronic device, and a print-data generating unit. The system accepts documents via a web page or other means, calculates the charge for printing the document, and notifies the user of the payment code issued by an online payment service. Once the charge has been paid, the system executes the print job based on the print data. The system aims to reduce labor costs and ensure the safe reception of payment.
What overhang angles can FDM print?3 answersFused deposition modeling (FDM) can print structures with variable overhang angles. The maximum overhang angle that can be achieved without compromising the printing process and structure is 35°. In another study, different print orientation angles between 5° and 85° were considered, and the surface roughness of the printed structures was analyzed. At high print orientation angles, the roughness profile changed, showing a gap between adjacent peaks. Additionally, a study on building tubular components with variable overhang angles using laser directed energy deposition (LDED) found that the technique allows for the manufacturing of support-free bent pipe parts with 45° and 90° bents. Therefore, FDM and LDED processes can achieve a range of overhang angles, depending on the specific printing parameters and techniques used.
Issues with FDM printing5 answersFused Deposition Modelling (FDM) printing has several issues. One common issue is the dimensional accuracy of printed pieces, which is affected by factors such as bottom/top thickness, filling density, and placement position. Another problem is the non-sticking of preliminary layers to the hot bed, especially when printing cylindrical objects. This can lead to under extrusion, over extrusion, gaps in top layers, stringing or oozing of filament, and other issues. Residual stresses are also a concern in FDM parts, causing warping, de-layering, and distortion during the print process. Techniques like depositing glue on the bed are used to mitigate these issues, but they can increase residual stresses. Material-related errors are frequently encountered, such as filament breaking, nozzle clogging, and filament falling out of the holder. These errors can interrupt filament flow and hinder the printing process. Additionally, multi-axis FDM printing introduces challenges in determining the nozzle printing path, requiring efficient methods to optimize printing time and quality.
How does warping affect the mechanical properties of FDM printed parts?5 answersWarping in FDM printed parts can affect their mechanical properties. The distortion caused by warping can compromise the accuracy and reliability of the printed parts, making them deviate from the intended shape of the design. ABS material is particularly prone to warping in FDM printing. However, applying the ironing technique within the first three layers of the specimen has been found to reduce warping in ABS parts produced by FFF. The mechanical properties of FDM printed parts are also influenced by other factors such as the filling angle, fill shape, air gap, print orientation, print temperature, and material and pigment manufacturer. Therefore, understanding and controlling these parameters is important for predicting and optimizing the mechanical behavior of FDM printed components.
How can TPU FDM-3D printed material be used to create lightweight, durable, and flexible objects?2 answersTPU FDM-3D printed material can be used to create lightweight, durable, and flexible objects by combining it with other polymers such as PLA or ABS. The adhesion between different materials can be improved through various processes such as post-processing with acetone immersion, surface activation during printing with acetone or tetrahydrofuran, post-processing annealing, and connection of printed parts with tetrahydrofuran. Additionally, TPU can be laminated with ABS using the laminated object manufacturing (LOM) technique to create functionally graded, sandwiched structures with enhanced mechanical properties. Furthermore, TPU can be combined with MXene, MnFe2O4, and multi-walled carbon nanotubes to create composites with adjustable sensing properties and electromagnetic shielding performance, making them suitable for wearable electronic devices. TPU can also be blended with PLA and processed through FDM to create shape memory polymers with improved ductility and shape memory properties. Finally, TPU can be used to fabricate re-entrant honeycomb structures that exhibit non-traditional deformation mechanisms and can be integrated into engineering applications as crash energy absorbers.