The WhistleBlower  Prusa i3 X Carriage for E3D Chimera with builtin layer fan
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The WhistleBlower - Prusa i3 X Carriage for E3D Chimera with built-in layer fan

Also see Front mount for BLTouch What is this The WhistleBlower is a ...

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The WhistleBlower - Prusa i3 X Carriage for E3D Chimera with built-in layer fan alternatives