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Replacement o-rings for the IR sensor of the Fuse 1+ 30W. The kit contains 2 o-rings. 
<a href="https://support.formlabs.com/s/article/Unboxing-and-setting-up-the-Fuse-1-plus#install">Installation guide</a>

Fuse 1+ 30W IR Sensor O-Ring Kit

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Fuse 1+ 30W IR Sensor O-Ring Kit

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