Knob/cap for old radiator valve

This model is for a very common old type of European radiator. This one is for a flat in Madrid, Spain.

A replacement wheel head control knob to fit on a wide range of radiator valves.

This cap will fit valves spindles that have a square end with a screw hole in the middle that is 6.3x6.3mm.

Full size: 33.80x33.80x36mm

Print in ABS or PETG with at least 3 walls and at least 5 bottom layers. I used 30% triangle infill with great results, but any should work fine.