ANET A8 XBELT TENSIONER 1420 SCREWS WIDE PULLEY
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ANET A8 X-BELT TENSIONER 1/4-20 SCREWS (WIDE PULLEY)

I bought replacement idler pulleys and they were a bit too wide to fit the original xaxis tensioner design I tried ...

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ANET A8 X-BELT TENSIONER 1/4-20 SCREWS (WIDE PULLEY) alternatives