M5Stack Extension Module by macsbug https://macsbug.wordpress.com/2020/01/30/make-an-m5stack-case-part-1

Printer : Replicator 2X Software : MakerBot_3.10.0 . Change Dimensions : Scale To : 101.45% . Print quality : Standard . Raft : on . Support : ( on or Unselected ) . Layer Height = 0.20mm, . Infill =100% . Number of Shells = 2 Extension_kit_for_Replicator / Extension_single .. Ext_h83s.dwg .. Ext_h83s.stll : Raft=✓,Support=✓ / Extension_double .. Ext_h83d.dwg .. Ext_h83d.stl : Raft=✓,Support=✓ / Rear_cover .. Rear_cover.dwg .. Rear_cover.stl : Raft=Unselected,Support=Unselected / Extension_front .. Ext_h83s.dwg .. Ext_h83s.stll : Raft=Unselected,Support=Unselected