POM Plastics Wheel with Bearing Round Pulley Durable Linear Bearing 3D Printer

The V-Wheel is designed specifically for V-slot aluminum extrusion rails and is the most common choice for 3D printer carriages and CNC gantries. The Small and Large Round wheels suit flat or round rail applications and general pulley roles. The Idler Wheel is used as a belt tensioner — it redirects or tensions a timing belt without driving it. Check your machine's BOM or frame type to confirm which profile fits your build.

Each wheel comes with a standard sealed ball bearing press-fitted into the 5 mm bore. The bearing is compatible with common 625 or 695 series dimensions depending on the wheel size — confirm with your machine's specification. Bearings can be pressed out and replaced with a bearing press tool if they wear over time, though the POM wheel body typically outlasts the bearing in normal use.

Yes — these wheels are dimensionally matched to the OpenBuilds V-slot wheel standard, which is used across a wide range of Creality (Ender, CR series), Anet, and other open-frame 3D printers, as well as OpenBuilds ACRO, OX, and WorkBee CNC platforms. Always verify the bore size (5 mm) and wheel profile match your existing hardware before ordering.

POM (acetal) offers superior dimensional stability and a lower friction coefficient compared to nylon and most FDM-printed PETG wheels. It resists creep under sustained load, meaning the wheel retains its round profile even after extended use under spring or eccentric spacer tension. POM is also less hygroscopic than nylon, so it won't swell or soften in humid workshop environments.

POM is inherently self-lubricating, so the wheel surface running against the extrusion rail requires no additional grease or oil. The pre-installed bearing may benefit from a small amount of light machine oil or PTFE-based lubricant applied to the bearing seal after extended use (typically 500+ hours of operation), but this is optional for most hobby-level machines.

A standard CoreXY or Cartesian 3D printer typically uses 6–12 V-wheels for the X/Y gantry and Z-axis carriage, plus 2–4 idler wheels for belt routing. For a full rebuild or new build, the 5-piece pack offers the best value. For a single-axis repair or replacement of a cracked wheel, the 1 or 2-piece pack is sufficient. Refer to your printer's assembly guide for the exact count.

Yes. These POM wheels are a popular choice for diode laser engraver gantries (such as xTool, Sculpfun, and similar V-slot frame machines) and lightweight CNC routers where V-slot extrusion is used as the linear guide. They handle the lateral and radial loads typical of these applications well. For heavy-duty CNC spindle heads with significant cutting forces, consider supplementing with additional wheels or upgrading to a full linear rail system.