I carried out a concrete pour recently for which I was reinforcing with A193 mesh. 

I forgot to order risers to hold the mesh so quickly designed and printed a number of these to suspend the mesh at around the 55mm mark. Support has notches designed for the ‘over under’ layout of the mesh and plenty of pass-thru holes to enable the poured material to permeate the supports

I printed mine in PETG with 2 perimeters which seemed plenty sturdy enough and supported my weight when walking on the supported mesh