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So you save a lot compared to buying a new one. The conversion kit for removing and replacing the hardware in the MacBook Pro, iMac or Mac mini is not expensive at all. On the Amazon product page you can choose different models, depending on which Apple MacBook (Pro) or Apple iMac you have: In the said set for expanding the SuperDrive and replacing it with an SSD hard drive (or an HDD, if you still have a suitable one lying around), there is a frame for the same, a housing for the removed drive with USB 2.0 connection for further use as well as suitable tools included. You might also want to consider the environment in your decision.Sir Apfelot recommendation: Clean up your Mac hard drive with CleanMyMac HDD / SSD adapter kit: replace SuperDrive with hard disk buying an adapter to re-use the Apple SSD. You can factor cost & your research time into your tradeoffs for buying a new drive vs. I saw no prices provided on Sintech's website, but another answer stated that his cost was $13.99. However, ferreting through one of the manufacturer's websites (Sintech) provided in this answer led to this page of macbook SSD adapters which may be of some use. Some of the links are now broken, meaning some of the recommended adapters and sources are no longer available. That Q&A pertains to a Macbook Air early 2014 which requires a different adapter than your Macbook Pro 2015, and Your question has now been closed as duplicative, but in reviewing the duplicated Q&A, it will be noted: Making this still more difficult is the fact that Apple changed the SSD interface design periodically, and so the adapter required may be unique to a model or model year. In other words, you can only re-use an Apple SSD in another machine IF you have the correct adapter. Apple's proprietary design of the SSD's connector/interface means that an adapter will be needed to use it in a device with one of the industry standard M.2 interfaces. But as has pointed out in his comment, as a practical matter, the answer is: "It depends".
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