BLV mgn Cube¶

Open-source 3D printer

The BLV mgn Cube is an open front CoreXY 3D printer that runs on MGN linear rails. It was designed for accuracy, efficiency and print quality, with one simple goal: to let anyone build a good and reliable 3D printer.

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BLV mgn Cube 3D printer

BLV mgn Cube at 9000 mm/s² acceleration and 500 mm/s

Why build it¶

Fast, reliable, accurate. Most low and mid range printers ride on linear bearings or Delrin wheels because they are cheap, and they give up accuracy and reliability for it. MGN linear rails are stiffer, more precise and much smoother, so the Cube prints fast without losing quality.
Rigid open structure. The open front is as rigid as a closed cube and still gives easy access to the bed. The design came out of many hours of simulation and physical stress tests. A front belt tensioner keeps maintenance simple.
Accessible. There are no rare or expensive machined parts. Everything is printed or bought online or locally, and you can use your own electronics if you know how to adapt the firmware.
Open source. The original STEP files are included. Remix and improve them, and please share your work, mark the parts as remixed and link back to the project.
Ready to print. Tuned firmware settings and slicer profiles are included. Upload the configuration, load the profile and print.
Modular. Height and bed size can grow with longer extrusions and rails. A size calculator helps you plan a custom build.
Honest about the effort. Installing and aligning the rails takes about 70% of the build time. 3D animations, PDF guides, sketches and measurements make it manageable.
Balanced budget. A top 32-bit board, good motors and reliable sensors, without overspending. The 5" PanelDue screen is optional. A phone or tablet works just as well and saves about $80.

Specifications¶

CoreXYopen front frame 300 × 300 mmbed (350 × 350 custom) 365 to 665 mmbuild height 500 mm/swith Klipper 9000 mm/s²acceleration Triple Ztrue bed leveling MGN12Hlinear rails on all axes RepRap / KlipperDuet 2, Duet 3, Spider

Input Shaper (Klipper) and mesh auto-leveling
High resolution X/Y stepper motors
TMC5160 48V high voltage driver support
Efficient part cooling, Bowden or direct drive
Dual extrusion option
Front belt tensioners
HEPA and carbon air scrubber
Internal LED lighting
Electronics mounted at the back
Web control from phone, tablet or desktop
SuperSlicer and Simplify3D profiles
Full firmware configuration included

Upgrades. Two official upgrades followed the original design, and both are part of the project files. The Metal Kit replaces most printed parts with CNC aluminum. The Blind Joints frame needs no brackets and assembles in about 20 minutes.

Explore in 3D. Measure and isolate any part in the browser: full printer · frame only · panels and walls.