Whilst designing my own CNC from scratch after being hooked by the mostly printed CNC I decided one thing I had to have was a method to fine adjust the bed work area other than the legs. As can be seen from the photo I have used 40mm M8 and plenty of adjustment available board pictured is 18mm MDF.

So here is my simple solution the bed can be adusted at 4 corners and if necessary middles too by use of top and bottom m8 nut and bolt.

Simple but effective I will be combining and incorporating into the feet of MY MP_CNC in the future when time allows and will upload that version when done.