LittleRP Build Plate Holder (Auto-Aligning)

A modified version of the mk3_vrail_arm_spacer.stl: An additional stop angle at the lower back automatically aligns the build plate on attachment, thus allows one hand operation.

See here for video demonstration:
https://www.youtube.com/watch?v=-_FKArUHYoM

See here for discussion:
http://www.buildyourownsla.com/forum/viewtopic.php?f=19&t=2613

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