I am really happy with my home build! I picked up a AC/DC Power supply and made my own wand for it (Dowel, brass screw, felt and a graphite block instead of a brass block). I put the dial just over half way for regular etching of my logo and it gets good and deep! I do 10 second intervals, like 4 or 5 of them to deep etch the blade, plug the contacts into the AC plugs and blacken away! Magnacut doesn't etch as easily as say 1095 would, so I do longer for stainless steels. If I crank it all the way up, it etches deeper and quicker, but I need to clean the felt pads more often since they get a blank gunk in them which prevents the current from flowing/etching. I got a pack of like 12 or 24 different colors of 12x12 craft felt and they work great and I have plenty! I use the SC-E1 electrolyte from Pops.
I can electro etch jimping on the spine of knives that is actually effective! I cranked the DC up to the max and did several 10-20 second cycles, then rinsed the blade in cool water and repeated a few times. The felt pad on my wand gummed up quick, so I would remove the felt pad and rinse the gunk out at least once during the process. I use a CriCut to cut the stencil for the etching. I just used capital "I" letters for my stencil.
Mine goes to 15 volts and it is plenty to etch deep! I am not sure why 24 or 30V is needed to etch deep? Personalizer Plus is nice, but $$$. I am into this setup less than $100 for the power supply unit, wand, alligator clips and felt.