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Replacement optical cassette assembly for the Fuse 1 and Fuse 1+ 30W. 
<a href="https://support.formlabs.com/s/article/Removing-and-replacing-the-Fuse-1-optical-cassette">Installation guide</a>

Fuse 1 Generation Optical Cassette

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Fuse 1 Generation Optical Cassette

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