bolt or a cover plate insert should be sized at 98% of
the original size or reduced for a better fit.
• Parts that have to receive another part (like a
standoff or a washer) should be sized 103% of the
original size or increased for a looser fit.
One final tweak is that “real” parts like threaded
bolts and screws can cut threads in a HIPS
replacement robot part (see Figure 9). This feature
can be used to your advantage when increasing or
reducing a model’s size is not a practical option.
The advent of newer filaments from LulzBot
partners (like ProtoPlant) is quickly closing the gap
between these instant robot parts being substitutes
versus direct replacements.
Consider these new filaments that might help
bridge that gap: Stainless Steel PolyLactic Acid or PLA
($56 per 500g reel), Magnetic Iron PLA ($48 per
500g reel), and Conductive PLA ($48 per 500g reel).
Best of all, these newer filaments can be used with
the LulzBot Mini.
In less time than it takes to read this final paragraph,
you can locate, download, and begin printing your own
robot parts (see Figure 10). While these plastic parts are
direct substitutes for most commercial parts, newer high
metal content filaments could make your next robot an
instant success. SV
Figure 10. Two washers, a length of mini channel, and one "HIPS"
channel piece printed in 75 minutes for an urgent project.
SERVO 01.2016 49