Hollow Calibration Cube

by Starno, published

Hollow Calibration Cube by Starno May 12, 2010
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Hollow Calibration Cube by Starno is licensed under the Public Domain license.

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My Makerbot was having a hard time printing out thin walls with water-tight settings, so I made this simple hollow cube to calibrate again from scratch. The walls of the cube are 1.5mm because that is the minimum thickness I would ever use. (See the OpenSCAD files if you\'d like to change dimensions)

While going through the calibration process, I strategically changed one Skeinforge parameter at a time no matter how mundane or obvious the change seemed to be. The process is documented with expected vs. actual results, notes, build times, high res pictures, and download-able gcode files for those interested in SkeinView-ing.

You can find it on the Wiki: http://wiki.makerbot.com/skeinforge-calibration-logs

2 Hollow Cubes.stl is for optimizing oozebane or extruder controlling for multi-part prints. (I haven\'t gotten that far, yet.)


If you are new user and/or intimidated by the process of calibrating your Makerbot, I encourage you to document your entire process so that it will be easier for others to have a clear perspective of what you\\'ve done in case you encounter problems.

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What is the size of this cube supposed to be when printed?

Looks like 24mm when I imported but I want to make sure. I've used this calibration cube to help me tweak my Printrbot Simple. Thanks!

I'm honestly not sure, sorry. This was originally intended for Skeinforge 6 to optimize thin wall toolpaths, while also being able to calibrate oozbane and bridging. Things have certainly come a long way since then. You can change the SCAD file or use another calibration file for accuracy calibration.

Cool, but I can't click "I made one!" since all rights are reserved. :( That is, if I did make one, which I'm not admitting. ;) P

That was unintentional, now its public domain.

Awesome, thanks! 8-)

What settings do I change if it's making a bunch of tiny jog prints in between the outer and inner layers in the walls? I've had this problem with other walled boxes I tried to print. it fills the out wall and inner wall but then stutters violently trying to fill the wall.

change fill
gt; infill permimeter overlap (down) and infill width over thickness (up) as well as carve
gt; layer height (up) until the Skeinlayer view only has straight lines in the layers with only walls (you don't even need to print it to check). Also, you can shrink the hollow cube down until it's only a few layers so that you g-code generation goes a lot quicker. After the gcode generates with only straight lines, tweak your flow rate until your printer is actually producing liens that have that width over thickness ratio.

I dont think the jogging is necessarily a bad thing, its just not the most time efficient method of filling the walls. I think it has to do with tweaking layer height and feed-rate so your optimal result would be 3 straight passes at 0.5mm a piece. This would be a good question to bring up in the Makerbot Operators google group, as someone might know for certain.

Damn, you are guilting me into documenting my calibration process. Well making a google spread sheet would be helpful for me my self too.

I commend you for doing Science to it!