Changing feeder tension changes the depth of the indents, and thus the effective diameter of the feeder wheel. And it changes the partial slipping of the filament (=filament speed not exactly matching the wheel, due to the indents being stretched by the resistance in the feeding traject).
So I can see that both variables (depth of indents, stretching of indents) have an influence. And they will change with material stiffness too. The wheel will bite deeper into a softer material, and it will stretch more.
Additionally, speed and temperature are going to play a big role too, because they affect flow-rate, and mechanical accuracy (overshooting, ringing).
So I guess there will allways be quite some trial and error for this sort of jobs, especially if you are going to print it in different colors and materials. Which usually is the first requirement of kids, of course. :-)
On the Lego-website I once read that the development of "simple" bricks requires quite a lot of precision engineering, to get a good fit.
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conny_g 251
Thanks for your feedback, that confirms and extends what I have learnt about accuracy the last days.
I agree that it seems best to give it the final perfection by adjusting the e-steps.
Just trying that to tune that a little bit with every new piece. In the last iteration the difference between the lego pimples was already much less, having increased the e-steps by 2%.
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