Oops, posted this in the general forum but just found this forum...
Hi all,
I have a multi-purpose 3-axis robotic workcell, that I need to add an extruder head to, in order to make it a 3D printer. I've been working with some high-schoolers who have built the machine...
Workcell
PnP config
They also built an extruder feed mechanism (pics overdue), and we started engineering a hot end using chassis-mount power resistors for the heater (similar to the plastruder mk5), but it seems that's a very bad thing to do -- as even within max temp spec externally, these resistors can fail since the internal core temp can be much higher. And apparently they can fail violently. So I'm looking for a new hot end, but confused about all the versions/variations/tweaks etc. Of all the designs, which one really works best? "Best" meaning getting the finest extrusion, and reliable.
At this point, I'm leaning towards buying the parts and assembling it, or perhaps buying the hot end already-built.
Thanks,
-Neil.