I am finally at the point with my E3D Toolchanger where I feel confident in meeting a way larger set of use cases then a single extruder system. IOWs I feel my TC is fully certified and if I wanted to I could use it within a service biz. My criteria? 1. I can print anything a single tool machine can print... optimally. 2. I can print an object with 100% dense break away support using contrary materials (e.g., PETG and PLA) and get the same underside quality as a Fortus or mojo with dissolvable support. 3. I can print ALL the multi-color samples posted on Thingiverse by the Mosaic people, reliably, quickly, and without a massive purge brick. I'm also tackling stuff posted by MMU users as well. 4. I can reliably print multi material combinations such as PLA and TPU. The system is reliable. Yet it CAN be way more reliable! How? The biggest factor IMO is the number of tool changes. The more the tool changes the higher the probability of a small defect in the print or an accident. Tool changing is more than the mechanical complications. It's also impacts the behavior of the molten material at the hotend during disposition and fusion. The smaller the tool path the more tool changing, the lower the reliability. So the idea is to minimize the tool changing. When I attempted to certify the Palette (which has ZERO fault tolerance in it's system design) I learned how to minimize the splices. The exact same approach can be done with the tool changer. I use Simplify3D. No idea if you can do this with other slicers. With S3D you can specify how many layers you want to draw a part of the object before you switch to another part. As such with my Mk8 CloneR1 I was able to set it to 5 layers per part which in turn cut the number of splices down to less then 20% of what it would be if it changed color for each part of the overall tool path. The Mk8 nozzle is a much longer and conical in shape then the V6 is. On the tool changer I have been able to save about 50% of the number of tool changes simply by using this, but because the tip of the nozzle is so shallow I can only do 2 layers per part. We need a nozzle with V6 threads but with a much longer cone!