About this 3D model

I recently bought a rubber band loom from the store and decided that it could easily be modeled. I modeled this after the LaRose rubber band loom but made significant changes to it. This is only half the length of the original but is expandable so you should put 2 together to get the original length or put many together to make longer creations. The round connector was the easiest thing I could think of to make in tinkercad to link these however it may not be the best choice. If anybody has any better ideas let me know and I can change it. I do not have my printer yet so I can't print one to have pictures but if anybody prints one please post pictures of it. UPDATE: I have changed the size of the peg that is used to link these together. It is now smaller and hopefully will link together better. This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/2Wc9LJG0f4f