LEGO build plate I made to be put in a doll house. One is 224 x 264mm and the other is 216 x 264mm (one column narrower). They are similar in sizes, but these two were what I needed for my project.
I added small notches on the sides to make them stay in place better. You can however place them side by side in any direction and hold them in place with a lego brick.
The fit is quite snug, but I guess that depends on filament structure as well as print finish.
Update: Made a version where the diameter of the knobs were reduced from 4.8mm to 4.7mm. This makes for a less snug fit, which is more appropriate for kids with less strenght where you want to build and rebuild often. The original size is better for when you want to build and have it definitely stay there.
Have fun building!
The author marked this model as their own original creation.