Central Machinery (Harbor Freight) Slip Roll retainer block
thingiverse
The top roller on my Harbor Freight 30" Shear, Press Brake and Slip Roll would keep popping out since the roller seems too short for the half pin to hold in. So, printed this up with 4 perimeters at 0.8 nozzle and held it in with a clamp and it works like a champ.
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