Does anyone adjust a java model size, while im using a traincarts plugin

[sleek breach]

Hello! How do i adjust a model size limit, and also im using traincarts plugin to test this thing. If you found a solution lemme know.

and sorry for terrible grammar btw

[echo silo]

Generally that format restriction cannot be adjusted, as it's a Minecraft limitation, but there are some ways to get around it like armorstands