BMG Extruder
BMG Extruder exploded view
BMG Extruder Inside Exposed

BMG Extruder

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The Bondtech BMG™ extruder combines high performance and resolution with low weight. Together with Bondtech's proven and highly celebrated dual-drive technology, you can expect problem-free material feeding with this extruder.

The BMG™ works in both bowden and direct-driven applications, has a built-in fitting for the E3D hotend, and fits Nema17 stepper motors. For maximum strength and precision, the housing parts are professionally SLS printed in nylon.

Please note: This extruder only supports 1.75 mm filament and does not include the bowden adapter.

Bondtech Mini Geared Features
The Bondtech BMG™ extruder utilizes an internal gearing ratio of 3:1 together with precision cnc-machined nickel-coated hardened steel drive gears to give you a compact powerhouse for all your applications. Whether you require high-resolution prints with small nozzles or high-flow prints with big nozzles, the optimized gearing ratio combined with Bondtech's industry leading drive gears provides unparalleled pushing power and lightning-fast retractions in a lightweight and compact package.

Bondtech Dual-Drive
Bondtech's unique dual-drive technology delivers uninterrupted material flow without fear of grinding or slipping in even the most demanding conditions. Bondtech users around the world will attest that even in prints with thousands of retractions, their extruders perform flawlessly, with unmatched precision, and cause zero damage or degradation to the filament.

Multi-Material Capability
The BMG™ extruder feeds all types of materials with high reliability, from slippery nylons and soft TPU/TPE filaments to highly rigid and sometimes brittle carbon-filled high-strength materials. The extruder is designed for 1.75 mm filament, but has been tested for filaments ranging from 1.5 mm up to 2.0 mm in diameter, allowing for high reliability regardless of the tolerance of the filament used. The filament path is fully guided throughout the extruder body, and the housing maintains tight tolerances to the drive gears mitigating the chances of filament misfeed when the hotend experiences increased back-pressure or highly flexible filaments are used.

Adjustable Tension
The thumbscrew tensioner allows the user to fine-tune the pressure exerted by the drive gears onto the filament. This gives you the power to adjust the tension, according to your preferences, and to optimize it for the type of material you are using.

To be able to do material changes in a snap, simply activate the quick-release lever to release the tension on the material and pull the material to be changed out of the extruder. To load filament, simply keep the quick-release lever activated and insert the new material.

Multi-Application Design
The Bondtech BMG extruder can be used in a direct drive setup or bowden setup. This gives you the flexibility to choose what works best for your application. In addition to this, it also features an integrated hotend retention method compatible with the E3D-V6 hotends and others using a standard groove mount. Mounting your hotend is simple, secure, and wobble-free by means of just two bolts.

Flexible Mounting Options
The extruder fits any Nema17 stepper motor with a standard 5 mm shaft. This simple 3D printed bracket can be used to mount the extruder. The extruder is delivered without mounts and without a motor.

  • Weight without motor: 75g
  • E-step value: 415

Setup Guides/Datasheets
To learn how to attach a V6 Hotend to this extruder, click here. For viewing technical specifications on the BMG extruder, click here.

Important Notice Regarding e-steps
The value for the e-steps present in this description is the most common scenario:
1.8°/step motors and 16 bit micro-stepping.

The e-steps depend on:
  • The stepper motor angle per step: The most common is 1.8°. However, some printers use other kinds.
  • The mainboard micro-stepping setting: The most common is 16 bit. However, some boards may use other bit settings.

There is a directly proportional relationship with micro-stepping bits: If the micro-stepping is double, eg. 32bit, you should also double the e-steps value.

There is an inversely proportional relationship with angle per step:
If the stepper motor angle per step is half, eg. 0.9, then you should also double the e-steps value.