These must not be allowed to enter the 3D System. They will be caught in the corner and cause a Jam.

As the chains and discs slide inside the pipe, lubrication is required to avoid excessive wear and abrasion. Normally, when machining with a cutting fluid, sufficient cutting fluid remains on the chips to provide adequate lubrication between the chain and pipe. If dry material is being transported, a lubricant such as waste oil should be dripped onto the chain or material. When transporting materials that cannot be lubricated, roller corners and special design configuration is required.