The standard alu extruded.
@Chris_Holland I feel like the extruder arrangement is more critical to success with flexible filaments. If it doesn’t have a “well guided” transition between the gear and entrance to the hotend, you’re going to have problems. That’s where the ALU v.2 seems to have been improved.
The v2 Alu extruder is has much tighter tolerances. So it should be the choice for flexible filament.
@Brook_Drumm Do you think that it is worth it to get the v2 alu extruder, and use the standard bis hotness, or get the new all metal hotend.
@Brook_Drumm , I’ve thought some more about the potential thermal-degradation-of-goop issue that I raised, and in John’s teardown photo above the goop is only on the heatsink side. If that side gets above 260 degC, Very Bad Things will be happening all over the place and goop degradation will be the least of one’s worries. I no longer believe there’s any potential problem here.
Carl has been printing all sorts of stuff- even polycarbonate. Great results. All my confidence needs to be vetted by the public though. No doubt.