Adjustable footrest

Foot stool with adjustable height. Originally modelled for young lady as piano foot support. It's dimensioned for those specific planks, so I included FreeCAD model file so you can edit the parametric sketch and set your own dimensions as needed:My planks were 179mm wide, I added 0.2mm as extra space and it was enough - planks fit tight. Updates:2026-02-17: Made the legs threaded