Just sorting my electronics for my 1000 x 1000 Sphinx Laptop —-> Arduino —-> DQ542MA —-> Nema 23 (265 oz) First off thanks for a superb connection guide kyo. However I have a problem when doing a dry run set up on the bench On my old dual belted ox I could quite happily run at 4000mm min all day long. But I tended to run at 3500mm minute However not so on the current setup I have tried to run at 4000mm (loose steppers on bench) and it ramps up to speed and ‘stalls’ Not that I am going to run it at that speed but still happens at 3500. At 3000mm min it will run fine and have done a full 30 min dry run on the bench without issues. I have tried different microstepping with the same results. And happens on all controllers / axis / steppers I am thinking that although the steppers are more powerful the pps is lower resulting in the problem I’m getting. Pics of old and new steppers attached.