About this 3D model

This is a extruder designed around the g35l stepper and prusa 24mm mount hole x carriage. The length of the of the extruder is 42, so I would us 4x m4x60 bolts for the idler with four springs. For mounting it to the x-carriage I would 2x m3x50. To mount the stepper motor 2x m3x50 Bearing is a based on 624 O/D 13mm I/B 4mm width 5mm and mk7 maker gear this hasn't been made yet and hasn't got a groove mount plates made yet to fit but will be here shortly. the idea was trying to keep it small and central to the x-carriage hopefully ive achieved it