Power supplies and dc regulation

I have aquired an industrial 12v power supply. It can run at 20 amps. I would like to use it to power my Gen7 electronics with a heated bed. I looked at getting a 24v to 12v converter, but that doesn't help me with the need for dual voltage outputs. Is there a fairly simple DIY solution for this?

The "simple" solution would be to purchase a DC/DC converter from someone like Vicor or one of their competitors. They can be purchased as single, dual, or multi-output devices, but new they're usually not cheap. DIY? Maybe, if you have the electrical engineering background to design it or the wearwithall to google a design. There should be a bunch of designs in the wild, (and many at semiconductor sites in the form of reference designs) but I can't point to one for you.