Rat Rig 44 mm guage block
thingiverse
The Rat Rig assembly requires a precise 47 mm spacing from the inner frame and the back frame. With the electronics panel mounted this becomes a 44mm spacing. I found this difficult to measure and hold while tightening the bolts. I printed two of these one for the top and one for the bottom. Adjust one side at a time then use the blocks for the other. These did the job.
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