One of the challenges for recycling cartridges at the end of their life is how to do it cost-effectively and safely.
Toner is a fine dust and, as I discovered rather too expensively early on in my remanufacturing career, can and does explode. This a key factor when crushing or shredding cartridges, so it is good news that US based BS&B Systems have developed an explosion control system for cartridge shredding. A case of fewer bangs, more bucks!