That's an important thing for everyone to bear in mind here... my test pieces deliberately use thick layers to generate lots of flow.
If you're printing thinner layers, then the corresponding print speeds get much higher. For 0.1mm layers:
3mm³/s = 75mm/s
4mm³/s = 100mm/s
5mm³ = 125mm/s
6mm³ = 150mm/s
7mm³ = 175mm/s
8mm³ = 200mm/s
9mm³ = 225mm/s
10mm³ = 250mm/s
At 0.2mm layers, halve those speeds. So if your printer can consistently print the 6mm³ band, for instance, then you should be fine - in terms of extrusion capacity, at least - printing at any speed up to 75mm/s with 0.2mm layers.
Even the best set up printer is likely to fail before 10mm³ with certain plastics, or at lower temps. The fact that the test prints fail at some point is not necessarily a problem - particularly if its a failure that happens much faster than you ever print.
It's not a case of 'it must print perfectly, or else you have major problems'... it's just a tool to help you figure out what the speed limits are for various materials and temperatures.
(But it does also demonstrate that with the right materials and temperatures, it is possible for a well-behaved UM2 to reach the sorts of extrusion speeds that were seen on the UM1).
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Well, it seems that your extruder is rather weak. But if you usually print at or below 3mm³/second then you'll be ok. At that's actually pretty fast with thinner layers - 75mm/s at 0.1mm layers.
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