Ok, so for ages I've been thinking about if it would be possible/better to screww axles in so that I could change them easily if they got damaged or I wanted a different look etc. I recently purchased this sweet Lincoln Continental cop car that was beat up and the axles were stuffed. I pulled it apart and added some rust details to the paint as I loved the look as it was and pulled the axles.
Having just got a 3D printer for Xmas I decided to print a couple little axle holders and try my theory. Now, during testing there were a few issues and while I was removing one of them I accidentally broke the chassis as well, so the front had to have a custom block printed for it as well, to fill the gap - it's not quite square but that doesn't effect the handling at that point as it's just the grille is slightly off on one side but not a real issue.
You can see in the photos below the two screws that go into the block and there is a 0.8mm hole drilled for the axles, which are just cut off pins. The system is working great so far and I'm really happy with it. The drawback at this point is that you can't use a full axle set with it (as there is no way to add the axle without cutting it first) but I have another design that I'm working on currently for another car so will see how that one goes.
The other reason I like this set up is that it stops the axles wandering side to side and yet leaves it ultimately adjustable/changable as opposed to gluing it in place. Anyone else tried anything like this?