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Hi,schlotzz:

Thanks for your reply . I follow your suggestion , now the M5 screw have been fully go all through the idler .

But , the bad news is : after about 10 meters , the idler's M3 adjust screw make the idler to slope ....

I did not fasten the idler too much ...

so , should I use ABS to print it and test it again ?

Thanks