MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
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 ?