New corners

We have had some trouble with xy-wobble, and a bit of investigation seemed to point to the acrylic corners as the perpetrators. It seemed that the ball bearings did not fit properly into the laser cut sockets. Because the bottom of the socket was not flat it made the bearings lie at an angle, which seemed to make the threaded rods move off-center.
After finding a new printable set of corners for our RapMan 3.1 on Thingiverse, we decided to try them out. They were designed by another RapMan user, chylld, and can be found here. The reviews seemed positive and chylld has made extensive tests with them to ensure stability.
After printing, and mounting them on the printer, everything seemed good, and the wobble was reduced a bit.
However, when we came back to the printer the next day, the first print was horrible. It turned out that the friction between the steel rods and the corners was too low and everything was moving around and falling apart. After a good half day or readjusting the printer and applying duct tape between the rods and corners, the printer was back on track.
We suspect the reason to be our material, PLA, because the corners are designed and tested in ABS, which may explain the difference in friction.
We also had to redesign the front left and front right corners, because the pull from the y-motor warped the corner part, and the z-motor plate will also have to be redesigned at some point as it's sagging a lot.
All in all our experiences with these new corners have not been good, but for now, we blame our PLA.
Oh, and the xy-wobble is still there.

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