Dema Sprayer Pump Knob Sparepart

I recently bought a Dema pump sprayer at the hardware store. Filled it up, put it on a wanky surface, it fell over and the knob for actuating the pump broke into pieces. :-(

So I tried to design a new knob in FreeCAD and print it on my Mini+ – this is how it went :-) 

The knob came out fine with Prusa Slicer's default settings for “Quality 0.2mm”

Tip: the pump rod has a threaded end; in order to remove the old knob, grab the rod with gripper pliers and turn the knob anti-clockwise.