BabyBeltPRO: An Open Source Belt Printer Kit From LDO and West3D

What Is the BabyBeltPRO

The BabyBeltPRO is a belt-format 3D printer kit developed by Rob Mink and now backed by LDO Motors and West3D Printing. Instead of a traditional flat print bed, the BabyBeltPRO uses a continuous flexible belt as its build surface. Parts print on the belt, which moves along one axis as the print progresses. The result is a printer that can produce continuous prints taller than its frame, something a standard Cartesian or CoreXY machine simply cannot do.

The original Babybelt project started as a low-cost open source design. The goal was to build a working belt printer for around $200 using mostly 3D-printed parts and common hardware store components. Rob Mink posted the files to GitHub and documented the build process on YouTube. The project attracted a following among makers who wanted to experiment with belt printing without spending thousands of dollars on a commercial system.

Version 2.6 Brings LDO Hardware

The current BabyBeltPRO v2.6 kit changes the equation. LDO Motors, a well-known name in the Voron and high-performance 3D printing community, supplies the linear motion components. The kit ships with MGN linear rails, LDO extruders, and other hardware that would normally require separate sourcing and careful compatibility checking. That integration removes one of the biggest friction points for builders who are not deep in the Voron ecosystem.

West3D Printing handles kit sales and distribution. Buyers can purchase a complete hardware kit that includes the printed parts, motion components, belts, and fasteners. The GitHub repository remains open, so anyone can still print their own parts from source files or modify the design. The project's original philosophy of accessibility has not changed. The kit option is simply there for builders who want a faster path to a finished machine with guaranteed part compatibility.

Who Is This For

The BabyBeltPRO occupies a specific niche. It is not a general-purpose replacement for a Bambu Lab A1 or a Prusa MK4. Its strength is long continuous prints. A vase, a architectural model, a costume prop, or a prototype that needs to be taller than the printer's frame height all fit the belt format well. Makers who frequently produce tall, single-wall, or continuous-layer objects will find the format genuinely useful. Everyone else may find the belt movement adds complexity without a proportional benefit.

The kit is also a strong weekend project. Assembly time is measured in hours, not days. The GitHub repository includes build guides, slicer configuration notes, and a community Discord for troubleshooting. The v2.6 update refined the gantry design with a heavier X-axis rail and improved belt tensioning. Those changes address real complaints from earlier builds about flex and Z-wobble on tall prints.

The Market Context

Belt printers have been around in the maker community for years. The problem has always been that most of them were one-off custom builds with no standard parts list and no support path if something went wrong. The BabyBeltPRO kit changes that. It offers a validated design, a known-good bill of materials, and vendor support for the motion components. That matters for builders who do not want to spend a month hunting for compatible parts on forums.

LDO's involvement signals that the company sees belt printing as a viable product category, not a novelty. LDO already supplies high-end motion components to Voron, RatRig, and other popular printer platforms. Bringing that supply chain to a belt kit at this price point expands the addressable market for belt printing significantly. For builders on a budget who still want quality motion hardware, the BabyBeltPRO v2.6 kit is the most accessible entry point available right now.