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Brandon Heller
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306 followers
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Yes, 3d printers can be useful.  First time trying a puzzle-fit, and it worked great!

Files at http://www.thingiverse.com/thing:592463

Experienced all kinds of bugs: (1) an actual bug that got onto the hotbed crimp and fried it, (2) a Marlin firmware bug that prevents the filament from going forward (but still allowed retracts?), (3) filament bug: old brittle filament that broke or stripped, (4) hardware bug: worn filament gear + insufficient EZstruder tension.  
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2014-12-13
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Took apart the melty remnants of SpiderPig last night. GUS Simpson is still the most unique RepRap out there and i'm looking forward to whatever follow on +Nicholas Seward dreams up.
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Has anyone built anything large with a Sarrus linkage?  I've seen this page plus the printer on Thingiverse built with them, but other than that, nothing.  I'm curious what level of flatness to expect as the mechanism raises up.

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Oyster mushrooms ready to eat
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Kids, this is why you don't leave your GUS Simpson in a car, even on a California day that doesn't seem particularly hot.  Bad news: total loss.  Good news: the next one will be better. 
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2014-05-29
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SpiderPig first real print

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Printed out Johann's recirculating-ball carriage prototype today.  Had trouble getting the right support with Slic3r, so I ended manually adding some support in OpenSCAD.  The carriages are not as smooth as real metal ones (of course!) but are solid and usable.  Can't beat the price either, as the balls $3 for 100 and each carriage uses 38 of them.  This is up there for me with stuff like Emmett's gear bearings as a shining example of the kind of thing that would be practicaly impossible to do in one piece without 3d printing.  Very cool.

A few downsides, though:

They're a bit noisy, and most of the noise seems to come from the top ball "falling" down.  I left one ball out, because with it in the motion got rough, presumably because it forced each ball against the plastic track and probably left no space for imperfections.  A tiny increase in racetrack length (or perfect printing) might fix this.  It's easy to find the imperfections (mostly layer seams) but not so easy to fix them, as the inside is not easily accessible.

Another issue is that the assembly fully wraps around the OpenBeam.  Johann got things perfect as far as size, though; there's really no need for the screw to pull the sides together, and you could imagine alternate ways to pull them together, like an eccentric spacer.

Note the failed first print in the pics; I didn't have a bottom plate to keep the little supports together, and when the first perimeter came on top, they all pulled off the build plate.  Easily fixed with a bottom raft to hold the supports.

Printed on a mostly stock Kossel Air with the "real" bal rails and a non-geared extruder pushing 1.75 ultimachine red PLA @ 205C.

Source:
https://github.com/jcrocholl/recirculating
Pics from Johann's original:
http://flickr.com/photos/jcrocholl/tags/recirculating
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2014-05-10
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