Filament Transition (and a Doohickey)

I just finished two kilograms of black ABS filament. I wanted to move on to white ABS filament.

I originally tried to hand feed the next spool into the extruder as the old spool disappeared. That didn't work, unfortunately. I wound up having to disassemble the bowden tube, snip off a couple inches of black filament, and reassemble the bowden tube with white filament well past the extruder gear:

Based on forum posts, I was expecting it to take a while for the black to flush out completely, but it seems like a pretty clean transition:

It's a fun little doohickey. My toddler likes it as well.

It was a pain to slice, though. I spent at least a half-hour trying different scales to get it to a point where it would print as six shells, rather than being split into twelve. I eventually got it at 1.6x scale.

Original file here.

Nozzle: 230C
Bed: 100C
Chamber: 50C
Layer height: 0.2mm
Speed: 40mm/s
Time: 6 hours
Material: Hatchbox ABS (mostly)

Pencil Holder - Hexagons - 2x speed

I doubled the printing speed settings from 40mm/s to 80mm/s and re-sliced the model.

At the start, it was clearly operating at double speed, and on the second layer the Rostock started to stutter, like the three towers weren't in sync any more. I dialed the speed down to 75%, which seemed to eliminate the stuttering, then went back to 100% once the base was done.

However, the print still took 11 hours. I'm not sure what happened there.

Also, this print had some pretty bad curling on the base, presumably due to the (initial) high speed.

So, this has been an interesting experiment with printing faster, but I don't think I'll try 80mm/s again in the immediate future.

Original file here.

Nozzle: 230C
Bed: 100C
Chamber: 50C
Layer height: 0.2mm
Speed: 80mm/s (in theory)
Time: 11 hours (doesn't make any sense)
Material: Hatchbox ABS