Is there a way to slow the print down without having to reflash? I can do this manually using F500 for example. Do I add this command to my G-Code when printing?

I'm using Octoprint.

use M203: Set maximum feedrate (ie the speed)

you can then save the new feedrates with M500

If you want to slow the entire print down, see M220.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Thank you!

You could print via a host like Repetier host, that has a feedrate scroll bar that you can use on the fly.