1 files changed, 43 insertions, 0 deletions
diff --git a/src/HW/makerbot/printed-objects/document.en.rest.tt b/src/HW/makerbot/printed-objects/document.en.rest.tt
index 85775b2..7755110 100644
--- a/src/HW/makerbot/printed-objects/document.en.rest.tt
+++ b/src/HW/makerbot/printed-objects/document.en.rest.tt
@@ -50,3 +50,46 @@ a circle
 
 Sadly, the two halves have warped a bit during printing, and it will
 not be easy to glue them in such a way as to keep them "round".
+
+The benchmark piece
+===================
+
+Just to try it out, I printed `the RepRap benchmark piece
+<http://www.thingiverse.com/thing:968>`_.
+
+First problem: the raft wasn't sticking to the build base; solved by
+keeping the extruder nearer to the base.
+
+I discovered immediately afterwards that the build base was not
+precisely horizontal; I don't know whether the plastic build base is
+distorted, or the translation axes are somehow misaligned (hard to
+believe).
+
+After about forty minutes of printing, I notice that the model is
+distorted; it happens quite often, but this time it's warping the
+build base! In fact, I soon had to abort the print: the base had
+detached from the wooden support that holds it to the Y stage, and the
+extruded filaments were going every which way.
+
+Results:
+
+[% WRAPPER 'figure.tt' pic='img_0992' alt="half the benchmark piece" %]
+This is all I could print before having to abort.
+[% END %]
+
+[% WRAPPER 'figure.tt' pic='img_0993' alt="warped piece" %]
+See how bent it is.
+[% END %]
+
+[% WRAPPER 'figure.tt' pic='img_0995' alt="warped piece, from the side" %]
+From the side it's even more noticeable.
+[% END %]
+
+[% WRAPPER 'figure.tt' pic='img_0997' alt="warped base, from the side" %]
+And this is how much my build base has bent…
+[% END %]
+
+To do for next time:
+
+* check the orthogonality of the base
+* use the bolted build base, instead of the one held with double-sided tape