Geeetech

I believe you have proven the 4988 board defective. I would suggest that depending on age, Geeetech should replace it under warranty, however, if you are wanting to do something with it in a hurry, Amazon is your friend, just check shipping options so you know if you will have it in 2 days, 2 weeks,...

I found that by disassembling mine, and turning the bolt with the teflon liner end for end, so the end with teflon flush at the end mated to extruder tip, there was no cavity for filament to deform. Also made for reloading easier, as steps were smaller that the filament encountered while being pushe...

I have now read, I think, pretty much every thread in existence about bed leveling for the dual extruders, and I see a very critical step that is never mentioned. You can set your tips as much as you want, but if you don't have BOTH SIDES of your z axis at identical heights, you end up with compound...

John, a couple things to check: firstly, did you ensure that your power supply is indeed set to the correct voltage? It sounds like you have a power issue, based on the fact that you mention your temp readings at 0c. Also ensure polarities of your connections. Because you are using a combined AC/DC ...

If I am reading this correctly, you are asking if you can replace your second extruder head with the 2>1 head, and print simultaneously with the single head? (using single for supports etc.) I just bought an i3 Pro C, (as yet to be delivered), and had wondered the same, but I believe this was replie...