Should also add (referring to the above picture) that the all-metal geared extruder drive is really nice but I am not sure it was worth the cost. I’ve had no problems with it and it is a pleasure to work with; easy to load/unload/tension filament and a nice solid fit (in other words nothing is loosening off over time).
I replaced the direct drive assembly before replacing the extruder because I thought the 3-D printed drive was slipping. It was slipping but only because the extruder was constantly getting clogged.
@Chris Yeah - I plan on doing both - using 2 different colors, and using dissolvable material.
For artsy/craftsy stuff, I expect I’ll do some stuff with the same material and 2 different colors.
For robot parts, some require hard overhangs, which will use support material. For PLA, I’m planning on using PVA, which is dissolvable in water. PVA is the core ingredient in white glue. For ABS, I’m planning on using HIPS (High Impact PolyStyrene), which is dissolvable in Limonene (Limonene is often used in candle/soap making - it comes from oranges and has a citrusy smell). I’ve also seen HIPS used as a breakaway support (it’s more brittle than the ABS).