Our current manufacturing process makes it too costly to add the end of roll notification which would significantly increase the retail price. We want to allow any new cartridge to be backwards compatible with the machines we have made in the past, so we are limited with the changes we can make. Over the years, we have explored this option many times and added this feature to our Lamination Cartridges. Due to the nature of how the adhesive needs to be applied, we have not found a way to add a notification mark without greatly increasing the cost of the product.
We can offer you a way to estimate the amount of adhesive left on your roll. When the cartridge is out of the machine make sure the bottom roll is wrapped at least 1 time around the 1" core. For every time it is wrapped around you will get approximately 3" of adhesive. Although this method is not perfect, this may save you when you are trying to insert longer items into your machine.
We want you to have the best experience with our product, so rest assured we will continue to explore this options as technology and our products evolve.