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XYZ Simple Test Object for Makerbots & Repraps (90mm & 140mm)

by MakerCubed, published

XYZ Simple Test Object for Makerbots & Repraps (90mm & 140mm) by MakerCubed Nov 9, 2011
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Summary

Just made this to pinpoint any issue with my Prusa Mendel. It should work to test out any machine (in theory of course).

I created a 140mm one (since my calipers only go to 150mm) to check my Prusa Mendel, but I made one at 90mm too for the MakeBots out there.

The circle (which is half the size: 140mm object = 70mm circle) should be pretty hi-res so you can check if your belts are loose and stuff.

This also helps check the level of your build platform.

I used this object to really fine tuning my printer and seems to get things more accurate when measuring a printed object than just the carriage movements.

Instructions

  1. Print it out and measure.
    --- X & Y should measure to either 140mm or 90mm
    --- Z should be 30mm (the tower in the middle)
    --- The circle (outer diameter) should measure half the total size of the object you chose (70mm or 45mm)
    --- Measure the consistency & thickness of the outer edge to find any issues with your build platform.

  2. Adjust printer X, Y, Z values if needed
  3. Repeat step 1 & 2 until perfection is reached.

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Just needs axis identification. Nevertheless, grat design.

Why is this found when I search for parts listing "3 axis CNC" as a tool?

http://www.thingiverse.com/tool:31/things/page:5http://www.thingiverse.com/too...

Because it is a tool for 3 axis CNC 3D printers...

Hey can you confirm for me the z of the tower for the 90mm one of these? Based on some other models I was expecting around 3% but I got around a 20% error when I measured this. With how my cubes are coming out I think 20% isn't possible. I get an XML error when I try and download the scad to check myself. Thanks.

Never mind. Found my problem (it's that I was being an idiot)

I'm not familiar with the printer x, y, z value adjustment. Could you point me in the right direction? Thanks.

Follow the instructions I posted. Depending on your machine, to adjust the stepper numbers you probably need to tweak the firmware values on the driver board. I'm using "Sprinter" firmware with Arduino board and use the Arduino app to upload any changes.

Check out this video: http://youtu.be/wAL9d7FgInkhttp://youtu.be/wAL9d7FgInk

He explains how to do it on the actual machine, but after doing this, you should print out my pattern and use the object's measurements to get more accurate.

The formula is simple, Example:

Tell the printer to move for instance 90mm (or what you want, but the higher the value, the more accurate). Then measure the distance traveled (or use what printer printed), even to a decimal point. So if you get something like 87.4mm (when trying to move 90mm), then divide 90 into 87.4, and then multiply that by 90. So it would be like this:

(VALUE WANTED) / (divide) (VALUE MEASURED) = OFFSET

OFFSET X (Mulitply) (VALUE WANTED) = NEW VALUE

Many thanks for the detailed instructions and the link. They will be very helpful.

I'm having similar problems with my prusa and I was thinking about designing a similar object. But thanks to you I can just download it. Great stuff and thanks for sharing!

Glad to share the stuff I design! Since I've taken somethings from here that has helped me, I feel obligated to return the favor...Taken a design, Leave a design...

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