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When I design my parts the dimensions are 1 to 1 meaning there are no tolerances. For the parts ti fit correctly you will need a well calibrated printer and good quality filament. If a part does not fit on a certain printer then one would have to scale the object.

  1. As mentioned the parts should snap in but not with a lot of force.
  2. However you could have shrinkage with the filament you are using.
  3. The plates should help in your case. Simply place the appropriate plate inside the compartment of the bottom support where the screw is used to fasten the top arm. The lower part of the top arm should be resting on the plate.

Hope this helps.