Fwd: [MakerBot] Re: How Not To Switch Plastic on ToMs

---------- Forwarded message ----------
From: Luis E. Rodriguez <lrodriguezmail@gmail.com>
Date: Sun, Jan 30, 2011 at 7:35 PM
Subject: Re: [MakerBot] Re: How Not To Switch Plastic on ToMs
To: "makerbot@googlegroups.com" <makerbot@googlegroups.com>


In an mk5, just pause, pull out filament, shove new filament in, and
hit pause again. I did it during an infill to avoid perimeter ooze.
Not really an effect I crave all the time. I'd rather wait for dual
stepper extruders to emerge like the Ultimaker.

Luis E. Rodriguez

On Jan 30, 2011, at 7:30 PM, coasterman-1674 <coasterman@live.com> wrote:

> Happened to me during a 3x2x1 rubik's cube. I usually support the Z-
> stage (especially since I don't like warping the acrylic Cupcake
> stage) while inserting new filament, but I forgot. :(
>
> On Jan 30, 3:23 pm, krst <kerry.steven...@gmail.com> wrote:
>> I was switching from blue to red ABS and thought it would be fun to
>> switch in mid-print, thus making a two-tone object. I snipped off the
>> blue and fed in the red following the end of the blue filament, slowly
>> being absorbed by the extruder. To make sure I didn't lose pressure, I
>> pushed the red filament downwards a bit. Unfortunately, at that moment
>> the ToM was printing the first layer, and the added pressure very
>> slightly tilted the extruder platform down - just enough for the head
>> to score through the ABP belt. Augh. While the belt didn't rip apart,
>> the surface in that area is no longer suitable for printing. I can
>> however, position the belt to a "clean" spot and print - but I can no
>> longer print multiple objects reliably.
>>
>> Moral of the story: Never push down on your extruder while it's
>> printing. If you're changing filament on the fly, be very careful and
>> let the extruder eat it on it's own.
>>
>> Second Moral of the story: Always keep a few spare belts around ready
>> to go. In fact, these things should be considered disposable, anyway.
>
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