Manual MakerBot Replicator 2X (page 104 of 116) (English)

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There are two components to ﬁguring out

what detail size you can achieve on the

X- and Y axes. First is positioning accuracy.

Positioning accuracy tells us how precisely

the extruder can ﬁnd the spot it is looking for

on a plane. X and Y positioning accuracy on

your Replicator 2X is about .01 mm.

That’s a number you should consider when

modeling shallow surface detail, but for small

stand-alone or protruding features, you will

have to go larger than that. The limiting factor

here is the layer width. The layer width is the

same as the diameter of the extruder nozzle:

.4 mm. Because a single line of extrusion is

never narrower than .4 mm, no printed feature

can be narrower than .4 mm.

However, most slicing engines still can’t handle

features that small because they can’t print

a line alone: each layer perimeter must be a

closed loop. That means that the smallest

feature you can actually print is .8 mm -- the

width of two extruded lines side by side. The

MakerBot Slicer’s spur settings work to correct

this by allowing shapes that are not closed

loops, but these features are experimental.

ORIENTATION

Many of the problems you might run into

while trying to print dicult models can be

prevented by changing the orientation of

the model on the build plate.

MINIMIZE SUPPORT MATERIAL

You can build an object of any shape using

tearaway support structures, but supports

can be dicult to remove and use up

plastic. Make sure your object has a ﬂat side

to rest on. Orient your object to minimize

overhangs and bridges. For example,

printed right-side-up, these tables would

have unprintable bridges and unprintable

overhangs, but upside-down they print

easily. [http://www.thingiverse.com/

thing:18982]

MAXIMIZE OBJECT STRENGTH

Another thing to consider is the “grain” of the

printed object. A thin cylinder printed upright

will be composed of a series of circles placed

on top of one another. If you try to break it

in half, it will have as many natural breaking

points as it has layers, and will snap easily. If,

on the other hand, it is printed on its side, the

layers will run up along the cylinder, and every

layer will have to bend in order for the cylinder

to break. Keep this in mind when designing

objects, especially functional ones. A spool

holder is a good example of an object that

should be printed on its side for strength.

DESIGN GUIDELINES CONTINUED

104

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MakerBot Replicator 2X Manual

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