pieces of 3/8” x 4” aluminum tubing (#635242). This
tubing can then be held in place with 3/8” .770” clamping
hubs (#545596).
An even better alternative to the above replacement,
however, arrived right before this article was going to press.
A new line of linear ball bearings (e.g., 8 mm bore
[#535210], and 12 mm bore [#535214]) have been
announced by Actobotics. These linear bearings coupled
with suitable shafting could possibly transform DUPe1 into
a much higher performance 3D printer.
With all of these changes, it looks like I have my work
cut out for me — it’s time to build DUPe2! SV
SERVO 05.2015 61
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Figure 17. A sample print from the DUPe1 — a 3/4” calibration
cube; elapsed time 45 minutes.
Figure 16. Ready for testing the DUPe1.
