This is my first idea fom an other work and i have declined in meshs you can integrate in yours makes. Stay tuned, bookmark this, i make upgrades everytimes when i have new ideas.
A little warning before… some meshs are fragile in one or two direction(s) when you flex it, depend many factors… For example the 003 in long direction and it take many time to print.
How to Custom:
Open one of the three 3mf files i have made in 240x200 mm
In program in advanced mode you can see the mesh and 4 margins
Be shure the lock is unlocked in orange for resizing the margins
When you select the top margin, you can modify it depending your choice.
Before changing sizes you have need know one thing, every sizes are from the center of every shapes (center box in 3d).
For exemple: you want 100x240 mm, the top margin are 5 mm in X and bottom too, you have need to add 50 in the original size (50+5) and changing origin with the half of theses 50 for top and bottom. Change position with -25 for the top (207,5-25) and +25 for the bottom (2,5+25). Change sizes in X for top and bottom (50+5). If you want increase the height of the mesh, increase too the 4 margins in Z with the same heght.
Now you are ready to integrate meshs in your projects with adding pause at height option in prusa slicer…