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correlation between temperature, speed and extrution

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Question:

Let's say I am printing just fine at 220 degrees C at 50mm/second..Now I want to print at a higher print speed - 150-200mm/s. Do I need to increase the temperature by a certain amount to keep up with the printing (i.e., melting of filament)?

I would go for 100mm/s first, same temp, and see if everything holds up... then maybe crank it up to 150mm/s... 200 is something for certain models, and well oiled and worn in UMs. if the filament starts slipping, lower the speed (via M220 S100 means 100%), and set the temp 3-5 deg higher (M104 Sxxx), wait a bit, and then continue the print at your target speed with M220 S300 (for 150mm/s relative to 50mm/s) I found live tuning based on a known good print setting the best thing to learn what your UM does. use the same method to actually lower the temp as far down as possible.

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Thanks for your quick reply Joergen. Oh thats interesting that you mention 3-5 degs higher.. I increased the speed steadily to 400%...at about 250%, flow of melted filament decreased (it became spotty), so i was increasing temp 7-10degs at a time till i thought I had a steady flow at 245degrees and 400% speed.. At that point everything that could go wrong went wrong: bowden hot end jammed as heat reached the bowden quickly (I believe), filament began slipping, so i tightened the screw and that made the filament strip/deform, which resulted in the filament being clogged at the cold end; nozzle was oozing PLA from the side (between peek and nozzle)..with cuts to the bowden tube, it cannot reach the front left corner..:)

I ordered some pfa tubing from mcmasters today..

It seems to be an art :) But next time around, I will perform my tests in a more controlled manner..

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My temperature measurements are spot on (not everyone's is), which means PLA is printable at 190C. If I crack up the temp to 200C I can print around 80mm/s, at 100mm/s it starts to show minor flaws with 200C. I've cranked it up all the way to 200mm/s, with 230C, but then I got into backlash problems, and infill not filled problems.

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