Dim3nsioneer 557
Thanks a lot for your help. I checked they pulleys; they show a very slight wobble which seems to origin from the natural play they have on the axis. But when checking I found the x-motor not fixed very vell to the back plane and the front x-belt being not as tight as the back belt and as it should be. After having fixed these two issues, I get quite accurate prints (9.8mm when 10mm in the model, 100.0mm when 100mm in the model, 30.5mm when 30.6mm in the model, etc...) even when printing with 150mm/s!
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gr5 2,005
The plastic is shrinking. I doubt the fan makes much difference X versus Y as it blows more on top of the print than a particular side. Plus the shrinking should be exactly equal in X and Y shouldn't it?
Look at your 6 X pulleys. Move the head back and forth. Are the pulleys round? Or do they wobble? Some people have found pulleys with the hole not centered. Other's had the hole so large that when they tightened the set screw the pulley moved to the side. Maybe if you do something that is the same length as the circumference of a pulley (approx 60mm?) it will be more accurate? Just some thoughts.
Usually people who really care about a dimension design something in CAD, print it, then adjust by the error and print again. It seems crazy but that's also how most people do it with word documents (print everything twice). And it works as the printer may be off a bit due to shrinkage but it's pretty consistent if you print with the same settings and with the same PLA and with the same air temp etc.
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