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Higher OB1 printer design

by jbernardis, published

Higher OB1 printer design by jbernardis Jan 14, 2013
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Summary

This is a collection of new pieces for wired1's OB1 printer design to get more print height. The original OB1 only gave me 106mm of print height, not much of an improvement over the prusa I was replacing. By designing new corners and new apex pieces, I now have a max height of 188mm.

The first image shows the height limit I was reaching on the unmodified OB1. The X belt was hitting the frame while I still had quite a bit of vertical room. The other images show the new corner, the new apex, and the entire modified printer.

Instructions

Print two of each stl file and replace the appropriate parts on the OB1 design

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I just re-used the extrusions from the original design unchanged. Since the angle has changed, they don't mesh as well with the base, but they are held firmly in place by the bracket. The only pieces I added were two 104mm pieces, one on each side, between the new apex pieces.

I hope this answers your question. I'm not at all sure what you mean by "Z unto X"

What length of aluminum profiles for Z unto X?

Like the new top design, it is wide enough to drive a bus through there now :) Is it still as rigid as it was before? The top rail design gives you a lot of options for mounting stuff up there...

It is still very rigid. If I had gone another couple of millimeters, I could literally raise the extruder through the gap and get even more height. As far as accessories, I have a spool holder mounted on top in the center - you can see the bottom of it in one of the photos, and I have some LED banks mounted on the front off the two wings. The only issue I'm having now is that at that height, the filament seems to have a mind of its own. Instead of paying out smoothly from the spool, sometimes loops of it will be under enough torque to come down below the frame and encircle the extruder. I'm trying to rig up a central guide to limit the filament path.

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