Box Turtle Automated Filament Changer / Multi-Color System By Armored Turtle with BONUS Injection Molded Trays!

LDO BoxTurtle Kit — Open Source AMS-Style Multi-Material Filament Changer for Klipper

BoxTurtle is an open source, lane-based automated filament changer for Klipper printers — the AMS equivalent for any Klipper machine, Voron builds in particular. The LDO BoxTurtle (LBT) is the premium hardware version of the original BoxTurtle design, adding LDO pancake motors, an AFC-Lite board with CAN and USB support, premium anodized extrusions, pre-crimped cables, MJF PA12 gears, and LDO tires and feet — so you spend less time sourcing and more time building.

Printed parts are not included. STLs are available on the Armored Turtle GitHub. Full BOM at armoredturtle.xyz.

Starting 10/1/2025 this kit also includes Injection Molded Trays at no extra cost. Want a heated enclosure to dry filament? We have those here.

Every purchase from West3D benefits Armored Turtle and supports continued development of the BoxTurtle project.

How BoxTurtle Works

BoxTurtle is a Type B MMU — a lane-based system where each filament lane has its own dedicated motor that moves filament to and from the toolhead independently. There is no selector cart, no servos, and no spaghetti boxes required. When filament triggers a sensor near the toolhead (such as FilaTector), the lane motor synchronizes with the toolhead extruder for smooth handoff.

To handle rotation distance differences between the lane motors and the toolhead extruder, BoxTurtle uses a toolhead buffer — the TurtleNeck by Armored Turtle (parts kit included) or the Belay by Annex Engineering. Each lane also has an independent re-spooler driven by a brushed DC motor that rewinds the spool and assists filament feeding, preventing tangling and bucking during retraction. PWM control for the brushed motors is handled by the AFC-Lite board, a custom MCU developed by Isik's Tech.

LDO BoxTurtle — What's Upgraded Over Stock BoxTurtle

• LDO pancake motors — smooth, powerful lane motors for reliable filament movement
• AFC-Lite board — custom MCU with CAN and USB support for brushed DC motor PWM control
• Premium anodized extrusions — clean frame finish, no surface prep needed
• Omron D2HW filament sensor switch — reliable, precise filament detection
• Pre-crimped cables included — except the cable between Box Turtle and the printer itself
• Filametrix parts kit — for toolhead filament cutting integration
• TurtleNeck buffer parts kit — toolhead buffer to handle rotation distance mismatch
• Hard mount hardware — for rigid mounting to the printer frame
• MJF PA12 gears — for the re-spooler, precision-manufactured nylon gears
• LDO tires and feet — no need to print these parts

Specifications

Who Is This For?

BoxTurtle is built for Klipper printer users — Voron owners especially — who want an AMS-style multi-material or multi-color experience without locking into a proprietary ecosystem. It works with any Klipper machine regardless of form factor and integrates through the AFC-Klipper Add-On. If you're already comfortable with Klipper configuration and want to add reliable automated filament changing, BoxTurtle is the most community-supported open source solution available.

Resources

• BoxTurtle GitHub — Armored Turtle
• Full BOM — armoredturtle.xyz
• AFC-Klipper Add-On — required firmware component
• Support Armored Turtle development

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