The provided source material details the technical specifications and design features of the Bondtech BMG extruder series. This information is intended for individuals interested in 3D printer hardware, particularly components related to material feeding and extrusion performance. The data focuses on the product's engineering, capabilities, and compatibility, rather than on free samples, promotional offers, or consumer giveaways. The following article synthesizes the available technical information from the official Bondtech product pages.
The Bondtech BMG extruder is a compact, high-performance component designed for 3D printing applications. It is engineered to provide reliable material feeding for a wide range of filament types. The extruder utilizes Bondtech's proprietary Dual-Drive technology, which employs two drive gears to grip the filament from both sides. This mechanism is designed to prevent grinding or slipping, ensuring consistent material flow even with challenging filaments like flexible TPU/TPE or rigid, carbon-filled composites. The system is calibrated for 1.75 mm filament but has been tested to perform reliably with filaments ranging from 1.5 mm to 2.0 mm in diameter, accommodating variations in filament tolerance.
A key feature of the BMG series is its integrated drive gear assembly (IDGA). This design incorporates a new white plastic main gear and an integrated drive gear, assembled using a method that reduces run-out. The reduction in run-out is intended to improve the surface quality of 3D prints. The DDX extruder, a variant within the BMG series, also features this integrated drive gear to minimize run-out and enhance print quality. The housing parts for the extruder are manufactured using professional SLS (Selective Laser Sintering) printing with nylon, which provides maximum strength and precision.
The BMG extruder is built with an internal gearing ratio of 3:1. This gearing, combined with precision CNC-machined, nickel-coated hardened steel drive gears, provides significant pushing power in a lightweight and compact package. The design is optimized for both high-resolution prints with small nozzles and high-flow prints with large nozzles. The extruder is designed to be compatible with both Bowden and direct-drive configurations. It includes a built-in fitting for the E3D hotend and is compatible with Nema17 stepper motors. It is important to note that the extruder is sold without a motor, and the bowden adapter is not included.
The product line includes several variants to suit different printer configurations. The standard series includes the BMG and BMG-M (mirrored), BMG-X2, BMG-X2-M, DDX for Creality, and IFS for Prusa Mini. All models are 1.75 mm filament feeders. The e-steps value for the extruder is listed as 415 at 16 microsteps. However, the documentation notes that e-steps can vary depending on the stepper motor's angle per step and the micro-stepping setting. The provided e-steps value is presented as the most common scenario for 1.8°/step motors and 16-bit micro-stepping.
Recent design updates to the BMG extruder include several component changes. The motor gear is now made of brass instead of steel, which is corrosion-resistant and addresses infrequent oxidation issues. The POM gear attached to the main shaft is now black, which is described as an aesthetic upgrade to mask dirt on the white housing. The push-fit connector is now threaded, allowing for easier removal or replacement to facilitate clog clearance without damaging the extruder housing.
The physical specifications of the extruder are as follows: the weight without a motor is 75 grams, and the freight weight is 135 grams. The dimensions are 9.5 cm × 13.5 cm × 6 cm. The product is available in Standard and Mirrored versions. The extruder's multi-material capability is highlighted, with the ability to feed all materials with high reliability, from slippery nylons to soft TPU/TPE and rigid carbon-filled materials. The design is noted for its performance in prints with thousands of retracts, with users attesting to flawless performance, unmatched precision, and zero damage or degradation to the filament.
Conclusion
The Bondtech BMG extruder series is a technically specialized component for 3D printers, focusing on reliable material feeding and print quality. Its core features include Dual-Drive technology, an integrated drive gear assembly to reduce run-out, a 3:1 gearing ratio for high torque, and compatibility with various printer setups. The product line offers multiple variants to fit different printer models, with recent updates improving material durability and user-serviceability. All technical specifications, capabilities, and design features are derived from the official product documentation provided.