Suggestion for micro alignment of the Y axis rods

[daktylus]

I just finished step 7 of the half upgrade assembly instruction. Even when carefully measured the y-carriage did not run perfectly smooth. I then aligned the rods perfectly with the following procedure. Perhaps this might be included into the tutorial.

1. After installing the y-carriage with the heat bed, unscrew the rod holders with only one bearing so it can be smoothly moved along the aluminium extrusion (lower rod in figure 7.4 https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/master/half_upgrade/manual/assembly_instructions/img/fig7.4.png)

2. Pull the carriage to the front. Push at the front rod holder from the top (so it cannot move) and slide the carriage to the back. (this should push the back rod holder if it is not perfectly positioned)

3. Push on the back rod holder from the top and slide carriage to the front.

4. Repeat step 2 and 3 two to 5 times. After that, the carriage should be able to move freely back and forth without moving/wobbling the rod holders.

5. Fix the rod holders again by gently pushing from the top and tightening both screws

At least for my case, this resulted in an excellent movement of the carriage along the whole y axis. I also tested this method with completely offset rod holders. It consistently lead to the same result.

Cheers

[gregsaun]

Thanks, will be added!

[gregsaun]

Fixed with new build helpers and new assembly guide: https://guides.bear-lab.com/c/Frame