Last night, I had *another* spherical magnet break free of the CA glue on my effector plate mid-print! :( My printer uses 1/2 inch (12.7mm) spherical magnets, and I used my ball end mill to ream the cups on the effector plate before gluing the magnets. Instead of using more CA this time, I put a dab of ABS juice (acetone and ABS filament) into the socket and clamped the sphere overnight. It has held up to 15 minutes of printing so far...but then two *different* magnets let go...one of them on a carriage this time.
I am starting to question my sanity here. My first printer (Delta RepStrap) used an M5 SHCS with the spherical magnet attached with CA as the attachment mechanism. It printed over a spool of filament without losing a magnet, and ultimately failed because the effector plate was printed in PLA and it melted down several times printing ABS to the point where it was fatigued and rubbery even at room temperature. I printed enough Cherry Pi parts to make a replacement printer, but used an early CP-I effector plate and Johann's continuous ball sliders (that did not work well for me) because they were printed before the first printer failed. Those parts held up enough to print three new complete V-roller CP-III carriages, a new CP-III effector plate, and about 1/2 spool of other stuff without incident. In the past week, it has not been able to run more than 1/2 hour without throwing a magnet for some reason.
Long story short, I have decided to rip all of the magnets off of the current effector/carriages, wash them in acetone, and then install them onto the new CP-III effector/carriages using either a different brand of CA or else ABS juice if the one that I re-attached with it instead of CA last night is the toughest to get off.....
I am starting to question my sanity here. My first printer (Delta RepStrap) used an M5 SHCS with the spherical magnet attached with CA as the attachment mechanism. It printed over a spool of filament without losing a magnet, and ultimately failed because the effector plate was printed in PLA and it melted down several times printing ABS to the point where it was fatigued and rubbery even at room temperature. I printed enough Cherry Pi parts to make a replacement printer, but used an early CP-I effector plate and Johann's continuous ball sliders (that did not work well for me) because they were printed before the first printer failed. Those parts held up enough to print three new complete V-roller CP-III carriages, a new CP-III effector plate, and about 1/2 spool of other stuff without incident. In the past week, it has not been able to run more than 1/2 hour without throwing a magnet for some reason.
Long story short, I have decided to rip all of the magnets off of the current effector/carriages, wash them in acetone, and then install them onto the new CP-III effector/carriages using either a different brand of CA or else ABS juice if the one that I re-attached with it instead of CA last night is the toughest to get off.....