Extruders don't usually limit your print speed, they can move plenty fast.
Remember, every mm of filament is 3.5mm to 5mm of extrusion out of the nozzle, at 200mm per second, your extruder only needs to push 57mm of filament (at most). Even heavily geared down, it's not likely to be much, if any, faster than your movement steppers are moving. I have had mine up to (an honest) 280-300mm per sec, and not had an issue with a 5:1 geared stepper, and if I didn't have a problem, you won't.
Your print head is more likely to be a limiting factor than your extruder (hint, add more heat!), however, you will be most likely bottlenecked elsewhere. The longer the belts (more stretch) and diagonals (more leverage), the slower you will be. The taller the printer, the slower you will be due to longer belts and frame flex. Magnetic ball joints mean a BIG speed reduction. There is simply too much weight, and flinging that around, the belts will either stretch and cause head crashes or the joints will separate. Not to mention what that weight does for frame flex. I lost over 50mm per sec. on my Rostock switching to them and even then they were trying to come apart.
My big printer (1000mm tall/500mm wide, which flexes a tad more than a kossel Mini) struggles to maintain 100mm per second with any resemblance of quality, my little carry on size printer, which is solid as a rock, I use about 200mm per sec. when I want quality. Same parts, same printer design. The difference is belt length, leverage, and frame flexibility. My Rostock which sat right in the middle in terms of size and stiffness, also fit right in the middle for speed. Keep in mind, it's been my experience that people over estimate their speeds by almost double. My mini at 180mm per sec., is estimated by other printer owners to be 300mm per sec. every time I show it. When they see 300, they are shocked.
If you really want speeds well into the 200's you need a very strong and stiff frame, short belts and short diagonals. A Kossel Mini may have a short diagonal, but the belts aren't that short and the frame is far from stiff. The belts on my mini sound like an unplugged electric guitar when plucked, until you get that, you won't get close to 300.
Remember, every mm of filament is 3.5mm to 5mm of extrusion out of the nozzle, at 200mm per second, your extruder only needs to push 57mm of filament (at most). Even heavily geared down, it's not likely to be much, if any, faster than your movement steppers are moving. I have had mine up to (an honest) 280-300mm per sec, and not had an issue with a 5:1 geared stepper, and if I didn't have a problem, you won't.
Your print head is more likely to be a limiting factor than your extruder (hint, add more heat!), however, you will be most likely bottlenecked elsewhere. The longer the belts (more stretch) and diagonals (more leverage), the slower you will be. The taller the printer, the slower you will be due to longer belts and frame flex. Magnetic ball joints mean a BIG speed reduction. There is simply too much weight, and flinging that around, the belts will either stretch and cause head crashes or the joints will separate. Not to mention what that weight does for frame flex. I lost over 50mm per sec. on my Rostock switching to them and even then they were trying to come apart.
My big printer (1000mm tall/500mm wide, which flexes a tad more than a kossel Mini) struggles to maintain 100mm per second with any resemblance of quality, my little carry on size printer, which is solid as a rock, I use about 200mm per sec. when I want quality. Same parts, same printer design. The difference is belt length, leverage, and frame flexibility. My Rostock which sat right in the middle in terms of size and stiffness, also fit right in the middle for speed. Keep in mind, it's been my experience that people over estimate their speeds by almost double. My mini at 180mm per sec., is estimated by other printer owners to be 300mm per sec. every time I show it. When they see 300, they are shocked.
If you really want speeds well into the 200's you need a very strong and stiff frame, short belts and short diagonals. A Kossel Mini may have a short diagonal, but the belts aren't that short and the frame is far from stiff. The belts on my mini sound like an unplugged electric guitar when plucked, until you get that, you won't get close to 300.