I felt that itch again. No, not the one you are thinking of. I am still trying different creams to get rid of that one. I felt the itch to make something for the community. So here is the Conveyor Belt Pack!
It includes 3 different types of conveyor belts, 3 sets of leg extensions for higher rooms, and a wall entrance gate. Obviously the belts don't move, but with some clever scripting you could probably make a box move along it. They are low-poly, so you can easily fill an entire room without experiencing any lag.
These are free for both commercial and non-commercial use. I would appreciate a mention in your credits, but its not required. The download is attached to my next post, and it is a zip file that you should extract into your entities folder.
I look forward to your comments. Enjoy!