Painting caltrop

Since I can never find enough bits of small scrap wood to use for support when I'm painting or varnishing small objects, I've been using these. As they're equilateral tetragons, they'll sit point up wherever they're dropped. Hollow to use less material (resin in my case), ball ends to try to avoid marking soft finishes on surfaces and with a scoop in the face of the object to reduce the chances of them getting stuck to whatever they're sat on.

(Subsequently decided that PLA printers might have a better time with printing solid with infill, so made one for that too)