Bearings about mars-rover HOT 3 OPEN

In case this might come handy: I printed the rocker bogie part using ASA-X and the body and arm with PLA. PLA prints (at least on my Creality Ender 3) came out perfect, whereas ASA-X shrunk a tiny bit while cooling down, even if my printer runs inside a temperature-controlled enclosure. In such a case the rocker bogie ball bearings were a bit loose. I solved that by simply designing and printing with PLA a very thin "adapter ring", basically a cilinder fitting the gap between the rocker bogie assembly and the ball bearing iself.

I preferred not to use glue in order to be able to disassemble parts in case I need to in the future.

I hope this helps.

from mars-rover.

For me the print is real tight so I had to really force the bearing in place so they sit there without anything additional. But if the fit is not perfect you could use some Loctite super glue, I use that in some places, for example to get the small bearings to stay.

from mars-rover.

Ball bearing adjustment.f3d.gz
Ball bearing adjustment - steering wheels.f3d.gz

In case this can help, here's the adjustment rings I designed. They can be printed in PLA, 15% infill, 3 walls.

Ball bearing adjustment.f3d can be used to fill the gap between the body and the main rocker bogie bearing
Ball bearing adjustment - steering wheels.f3d can be used to fill the gap between the four steering bearings and the rocker bogie printed part

from mars-rover.