Introduction. As readers of this blog will know, I use a Diamond mixing hot end. For retraction to work with a mixing hot end, it is necessary to retract all loaded filaments concurrently. If just a single filament is retracted, then all that happens is that molten filament is drawn from one or more of […]
At the risk of stating the obvious, when changing from one filament to another with a mixing hot end, it is necessary to purge out the old filament before using the new one. This post is about the latest tool that I have added to my collection of methods to deal with this purging. Actually, […]
Before I launch into this, it occurs to me that people not familiar with mixing hot ends might be confused when I talk about tool changes. I explain how to define tools in another post, so I won’t go into it again here. Just be aware that a tool change and a colour change are […]
Further to my original post, I have found some inconsistency in results. I had written earlier that my thoughts were that the required purge amount was somehow related to print speed. My suspicion was that there is more molten filament in the melt chamber and above, (before the heat break) when printing at low speed […]
Most of the problems with multicolour printing revolve around the fact that when switching from one filament to another there is still some of the old filament in the system that needs to be purged before the new filament can be extruded cleanly. The usual approach is to use some sort of wipe or prime tower which is wasteful both in terms of print time and filament usage, so this is an alternative approach to the problem.