3D Printing - "It's all about design and quality output. Not how fast the printer can run."
If nearly burning down my Delta printer isn’t bad enough, I also have a problem with the Cartesian printer. It has so many run-hours on it, I have worn out the bearing in the extruder cold-end cooling fan. There is probably a sleeve bearing in this axial fan and the blades are barely spinning. It is supposed to run all the time at full speed when the printer power is on. Well, it doesn’t spin full speed now. It almost stops spinning. I can count the revolutions by just watching it.
Fire in the Hole!
My delta printer just about burst into flames in the middle of a print job. The printer was modified many months ago so it could use a heated print bed for printing ABS. I discovered soon after the modification that the controller, which is located under the print bed, could not deal with the extra heat when the printer was used for ABS printing. It worked fine about 50 – 60 degrees Celsius, but any higher the controller would eventually go berserk and die from heat stroke.
Spool Hole Theory
I read over and over again, rants from novice 3D printer users about the size of the hole in the spool of filament. They assume the manufacturers are total idiots with their usually large diameter center hole they build into their spools.
One of the critical parts in a FFF 3D printer is the extrusion nozzle. It's that part that lays the rubber on the road. The exact flow of plastic is determined by temperature which affects viscosity, filament feed rate which is pressure, filament size which is volume. Put those factors through an orifice of a specific size (which then is a metering device), the exact flow can be calculated. The nozzle is the orifice but it also determines the initial diameter of the extruded plastic.