Use it for the wall, with an older ipad, fittet for the IPAD 3-4. use 608zz bearings to mount the knobs in, my son loves that they run freely

printet with supports, i printed it in 0.01mm and the bearings fit snug... but guess 0.02 should be fine, since it is not that detailed, although the knobs have grips that likes 0.01 to get the details out.