This is a small 3,5mm diameter, 15mm long hook for erro tools toolboards, see pictures.
Note: see also my other toolholders for the same pegboard (some are depicted in the pictures).
I printed it on prusa i3 mk3s+ with 0,4mm nozzle in PETG, 3 shells, line width of 0,6mm, except for 0,45mm external perimeters,15% rectilinear infill and 0,15mm layer thickness
The author hasn't provided the model origin yet.