Your printer should be calibrated very accurately, a dimension error of just 1mm along the long axis can make fit difficult or impossible. A calibration device can be found at https://www.thingiverse.com/thing:3014091
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Remember to come back and post what you've printed as Make.
It's good for the designer and the community (that means you)!
To post a Make, come back to this Thing and click Post a Make.
Or, you can use the Thingiverse Mobile app found on
and the Apple App Store.