I printed the beefy idler clamp pivot from the lulzbot website. This one is the latest for their latest batch of mini production printers. It’s much thicker than the old ones and less likely to snap.
https://devel.lulzbot.com/mini/Gladiola/production_parts/printed_parts/beefy_extruder_idler/
I printed one last week and installed it on my mini. It was simple.
Make sure to print with at least a 2mm wall thickness and a 85% infill for printer parts.
-Jim