Three simple tools to help with the alignment of the Y rod holders and Y motor mount on the Bear frame. Use calipers to verify the size after printing.
The 82mm tool is for aligning the Y rod holders
The 54mm tool is for aligning the Y motor holder to the left hand (when facing the front of the frame) Y rod holder
The 59mm tool is for aligning the Y motor holder to the right hand (when facing the front of the frame) Y rod holder
The 120mm tool is for aligning the Y idler
The 134mm tool is for spacing the Y rod holders before the Motor mount or idler is in place.
All steps are detailed in the original build instructions below
For the rod holders: https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/master/full_upgrade/for_mk3/manual/assembly_instructions/step08.md
For the Y motor mount: https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/master/full_upgrade/for_mk3/manual/assembly_instructions/step09.md