Custom Eurorack mount of the 0-coast

this is not a module but could be mounted into rack

It is designed to run from about 320mA at +15VDC. If you run it at +12VDC it will consume around 400mA and there will be greater demand on power up as you would be powering an entire additional power supply circuit, not a module.
Running from +12VDC there will be less noise immunity but since most euro rack power supplies are pretty quiet, you will likely not experience any problems. If your euro rack supply is noisy or out of spec you could have trouble.
source:
https://www.muffwiggler.com/forum/viewtopic.php?t=153963&postdays=0&postorder=asc&start=425

http://www.makenoisemusic.com/synthesizers/ohcoast