Suggest an alternative to

Marlin

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.

Why do you think that https://github.com/OctoPrint/OctoPrint is a good alternative to Marlin

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with Marlin. Optional.

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