Drew's Printrbot YBar Ends
thingiverse
To enhance the Printrbot Y bar ends, adjust three corners of the build platform while limiting compliance in the X dimension. Use small springs and knobs to heighten the bed; nuts are available at http://www.mcmaster.com/nav/enter.asp?partnum=93886A110. Maintain the adjustable stop bar end for bed height adjustment. Attach a tabbed Y Bar end with a spring as shown in the picture, ensuring a small hole in your build platform for attachment. The long tab will restrict X-direction compliance. Smaller Y bar ends designed for X-compliance can be used on opposite bars, but drilling out holes may be necessary due to wider Y bars.
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