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.
Just tested the shaft this morning. The funny thing is i printed 4 out 5 track in 0.2mm or 0.15mm layer height. Those run fine.
The only one track I used with the tpu is printed in higher layer height. That actually has more friction and prevent the track from automatically dropping (your second video).
I am going to try another print tonight to test the system. I swap out the track and now it drops smoothly.
Can I offer one small suggestion?
I am currently using the spring track modification and one of the spring fell inside the channel, and I can't get it out. On your next iteration, it would be nice to add a small slot on the side so someone can use a small stick to get the stuck spring out.