Extruder Thumb Screw
$2.99
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Knurled extruder thumb screw assembly for idler-tension adjustment. This small hardware set includes the hand-adjustable thumb screw, compression spring, and washer/retainer used to set filament drive pressure on BMG-style extruders and the Voron M4/Mobius extruder BOM.
Why use this instead of a plain screw?
- Knurled head gives you quick, tool-free adjustment of extruder idler pressure.
- Compression spring keeps tension controlled while still letting the idler move with the filament path.
- Washer/retainer helps keep the spring located against the printed or molded extruder idler.
Specifications
- Assembly type: extruder idler thumb screw, spring, and washer/retainer
- Thread reference: M3 x 0.5 on Bondtech/BMG-style thumbscrew assemblies; confirm against your extruder before ordering.
- Known fit context: Voron M4 / Mobius extruder BOM and Bondtech/BMG-style or custom extruders that use this thumbscrew assembly.
- Finish: black knurled adjustment screw with spring hardware.
Common fitment
The official Voron M4 sourcing guide lists one thumb screw assembly for the extruder hardware. For BMG-style service parts, pair it with the BMG Clone Components Kit, BMG Clone Extruder Gears, or BMG Style Needle Bearings when those are the parts you are replacing.
What it is not
- Not an M4-threaded fastener. Here, M4 refers to the Voron M4/Mobius extruder project fitment.
- Not a full extruder kit; this is only the thumb screw tension assembly.
- Not a universal bed-leveling, panel, or case thumb screw.
