Driverless version

Kulitorum

Can you please make a version of the board with no driver, just output step-direction-enable signals? - and with 15 or 20 channels, please.

I am building a printer with the following configuration:

6 Z-axis motors
2 Y axis motors
1 X axis motor
1 nozzle rotation motor
2 actuators to manipulate details on the printhead
4 motors for feeding material

I would like to add more stuff (like z-axis auto level) but I am limited in the amount of step/direction signals I can use.

T3P3Tony

Wow, that is going to be some printer! In the short term, given how Z bed levelling works, can you just use 3 Z motors (possibly more powerful ones on external drivers) and the use the on board steppers for the 4 extruders and one of the manipulators?

Kulitorum

Well, they are actually all servo motors and not steppers. This is why I am asking for a driverless version, so I can add three or four breakout boards and have balanced step/dir/enable for up to 20 channels.

Kulitorum

This is the printer:

T3P3Tony

Concrete printer V2! Why 6 independent Z motors?

Kulitorum

@t3p3tony so I can do independent z-motor auto leveling, of cause, just like I do on my 300x300x450 printer. Home the machine, move head close to the leadscrews, change config to only move one motor, and auto-level that one, continue to all 6.

T3P3Tony

If your gantry is stiff then do you not need to do only 3 points? Slave the other three motors? Would that work?

Kulitorum

I can do a manual calibration, as I have done until now, just saying that it would be nice with a version of the duet with more channels for future printer builds.

Or at least one with all 10 channels available in one or two expansion plugs.

Kulitorum

T3P3Tony

Got it! btw we have 12 channels (two more on the CONN_LCD) header.