Triggered by a comment of @dim3nsioneer here on the forum I decided to try the setup of 2 Olsson blocks (@swordriff) in one head, to be able to quickly and safely switch between PLA and ABS, simply by operating separate hot ends and feeders for both materials. This also means you can use an alternative for your PTFE coupler for ABS (for example 3dsolex IPM coupler) but it's also usefull if you just use 2x PTFE, as the one used on ABS, with higher temperatures may get deformed, and will still be