I am using printer with ball screws and I can say that for me S-curve is really important. While belt motion got some elasticity ball screw got 0. This is really cool as I have no ringing at all and really smooth print but I need to live with very low Jerk and acceleration settings like 200 Jerk and 300 acceleration. If I got faster the ball screws start producing noise like hammering during direction change. Current jerk implementation is just stupid. It is okay to change the speed with jerk but it is not okay to change the direction with half of the jerk speed. So I am really waiting for S-curve to come as it really will make my system to perform really well and to be silent.

Hello,

I have build my own pcb for two additional drivers TMC 2660-PA (same as original). Pinout and the overal PCB design is exactly as Duex2 but with removed unnecessary components alike end-stops and mosfets for extruder and etc. I just need two driver and compact pcb. Unfortunately Duex is really big and can't fit for my purpose.

I have a problem with SPI, Duet do not detect the drivers neither try to select them. What I need to do in order to make Duet to search for those drivers same as it do for Duex2. How Duet identify that Duex card is attached ? As I use TMC 2660-PA I would like to use STallGuard for switch-less homing of my additional axis and to control current and micro-stepping trough the firmware.

Regards,
George