This is something I should have done a long time ago, even before I built the wings. (Mind you I didn't have a 3d printer back then, but there'd be ways of doing it the old-fashioned wood way!)
I've made 2 wooden cradles for the wings, which have printed plastic LE shape to support the LE of the wing and clamps at the back to keep the TE secure. On the bottom of the cradles are steel L's with a bolt through. The cradles and clamps have 6mm self adhesive foam rubber on all surfaces touching the wings.
The cradles can be sat vertically, as shown in the pics, on a wheeled dolly which has a vertical post that the bolts go through. They can also be sat at the top of some wing stands that I've also made (haven't got a pic as they're stored under the plane at the moment) with the same bolts. These stands comprise some heavy duty tripod stands from a drum kit (from the tip shop) combined with 2" diameter aluminium tube.