I started installing the TAZ 3 dual extruder as per the OHAI documentation, and have run into a few issues. First a few that apply to my base TAZ 3 before I installed anything new:
- The stock heater cable for extruder 0 is extremely tight, which could cause reliability issues in the future. I recommend in the future using slightly longer cable for that. All the others seem fine.
- The OHAI for the TAZ 3 dual extruder installation has a photo showing the connection of the thermistors. It shows a cable with a pair of yellow wires (heated bed thermistor?) going to the top thermistor connector on the RAMBO, connector number 0, and a cable with a pair of orange wires (extruder 0 thermistor?) going to connector number 2. My TAZ 3 wiring as supplied is the opposite, with orange going to connector 0, and yellow to connector 2. Since my TAZ 3 has been working, it’s hard to believe that it is wired incorrectly. Is the OHAI photo wrong? Or has this changed with newer firmware releases? I’m reluctant to install the dual extruder wiring until I understand why my TAZ 3 doesn’t match the photo.
Other comments about the TAZ 3 dual extruder installation OHAI docs:
- The supplied wiring harness appears to include cabling for two extruder fans, which is good, but it’s not explicitly covered in the OHAI doc and might confuse people.
- One of the extruder fan cables in the harness has a blue dot on both ends of the cable, and the other does not. I decided arbitrarily to use the one with the blue dot for an extruder 1 fan, but perhaps the OHAI should state what’s intended so that everyone does it consistently.
- The wiring polarity, or at least the color scheme, of the extruder fan cables doesn’t match the OHAI photo. In the photo, the red wire is on the left, and the black wire is on the right. The provided cables are the opposite. At the other end, the cables have red on pin 1 (denoted by molded triangle). What is the correct wiring?
- There is no documentation regarding connecting the ground lug. It’s obvious to me, but should probably be in the documentation.
I’m really looking forward to getting this going. I’ve intended to print with support material from the beginning, but haven’t had the time to build my own dual extruder.