My first ever Cherry Pi design used counter sunk magnets and steel balls. The holding force was never enough. I never tried countersunk with magnetic balls as by that time I had started to use the machined bolts and 10mm ball magnets. They work ok, up to a point. The limiting factor is the speeds you can reach, around 80mm/s reliably in my case. Some people have reported premature wear on the magnetic balls. Good lubrication is key. My latest iteration of effector attachment uses printed sockets on the effector and carriages with 8mm drilled balls on the rods. All held together with a length of spectra line and a spring. It works great and it gives you all the advantages of magnetic attachment with none of the drawbacks. I reliably print at 100mm/s speeds now. The limiting factor now is the extruder not being able to keep up. I'm working on that now.
Andy
Andy
