Bondtech OEM IDGA Set

Bondtech OEM IDGA Set for Voron Clockwork 2 — Integrated Drive Gear Assembly, Reduced Runout, Improved Surface Quality

The Bondtech OEM IDGA (Integrated Drive Gear Assembly) is a precision upgrade for the Voron Clockwork 2 (CW2) extruder that addresses one of the most common sources of subtle print quality degradation in dual-drive extruders: main drive gear runout. By replacing the standard multi-piece drive gear and shaft assembly with a single machined unit where gear and shaft are manufactured as one component, the IDGA eliminates the eccentricity that accumulates at the press-fit or keyed interface of conventional drive gear assemblies — delivering more consistent filament engagement per revolution and a measurable improvement in print surface quality.

⚠️ Compatible with Voron Clockwork 2 (CW2) only. This is not compatible with BMG, LGX, or other extruder types — those use different IDGA variants.
⚠️ Secondary drive gear, secondary shaft, and secondary needle bearings are NOT included. This set replaces the primary drive gear assembly only. For a complete drive gear kit including IDGA, use the BMG Drive Gears IDGA Kit.
⚠️ Axial play is required. When installing, allow a small amount of axial play in both directions — this lets the filament path self-correct. Do not constrain the shaft completely.
⚠️ Motor-face bearing clearance: ~0.4mm. The bearing facing the motor should have approximately 0.4mm of material between it and the motor face to maintain proper plastic gear engagement.

What Is Drive Gear Runout and Why Does It Matter?

Runout is the degree to which a rotating component deviates from perfect concentricity as it spins. In a conventional dual-drive extruder, the main drive gear is a separate component pressed or keyed onto a shaft — and even small manufacturing tolerances at that interface create measurable eccentricity. As the gear rotates, its effective diameter varies slightly, which translates directly into micro-variations in filament feed rate per revolution. These variations appear on printed surfaces as subtle banding or inconsistency in extrusion width — a pattern that repeats at the gear's rotational frequency and is notoriously difficult to tune away in firmware because it originates in hardware geometry, not in the control system.

The IDGA solves this at the source. By machining the drive gear and shaft as a single monolithic unit, there is no press-fit interface and no accumulated tolerance stack — the gear runs as concentrically as the machine that produced it, which is substantially better than any assembled equivalent.

Integrated Shaft + Gear — One-Piece Precision Machining

The core engineering of the IDGA is straightforward: instead of a shaft with a gear pressed onto it, the entire assembly is machined from a single billet. Gear teeth, shaft, and bearing seats are all cut to final geometry in one setup, which eliminates the eccentricity that arises when two separately manufactured parts are assembled. The result is a drive gear that spins on its own axis with significantly tighter concentricity than a conventional assembled gear — and that consistency in rotation translates directly to consistency in filament feed.

5×8×2.5mm Ball Bearings — Included

The IDGA requires 5×8×2.5mm ball bearings for correct installation — these are included in the kit. These are precision-spec bearings matched to the IDGA shaft dimensions. Using incorrect bearing sizes will affect shaft positioning and negate the runout reduction the IDGA provides.

Specifications

What's Included

What's NOT Included

When Do You Need This?

This is the right upgrade if you're running a Voron CW2 and seeing repeating surface artifacts on prints that don't respond to pressure advance tuning, resonance compensation, or temperature adjustments — the classic signature of drive gear runout. It's also the correct move when building a new CW2 and wanting to start from the best possible hardware baseline rather than troubleshoot later. The improvement is described by Bondtech as "slight" — this isn't a dramatic transformation, it's a precision refinement that targets a specific failure mode in conventional gear assemblies. For builders who have already optimized every other variable and are chasing the last few percent of surface quality, the IDGA closes that gap at the hardware level.

Resources

• Bondtech OEM IDGA — official product page, setup guides, shaft dimension drawings
• Voron Stealthburner GitHub — CW2 printed parts files and assembly documentation

Browse our full extruder upgrade selection at 3D Printer Extruders, or explore all Voron-compatible upgrades at 3D Printer Upgrades.