Z axis bed, delta effector

x-stride

Hello all,

This use-case might seem a bit unusual, and then suddenly I need it.

Does the firmware support it?

A workaround could be running the bed on an additional axis. Make it drop down, the reposition print head on layer shift

xstride

Phaedrux

I'm not totally clear what you're asking.

The smart effector can work as a Z probe regardless of what part of the printer the Z axis moves, if that clears anything up for you.

What exactly are you trying to do?

cosmowave

@phaedrux @x-stride
eventually he likes to rotate the bed?

o_lampe

I think he is trying to correct a layer shift.
For a Delta it usually means, you have to recalibrate it. Either on an empty bed or with the already printed part moved out of the way.

A possible workaround could be a new bed.g with "probing points only on part perimeters" and then resume the print from there.
But it would be even better to avoid layer shifts on a Delta....

alankilian

What if you wanted to take a printer that uses bed movement for the Z axis and hang a delta mechanism above it just for the X and Y axis?

That way you could have short rails for the delta and a long rail for the Z axis and get real tall prints.

Maybe that's what the original poster wants.

Now, is that possible?

x-stride

Thanks all for feedback - sorry if I was not clear.

@alankilian Exactly! Stripping down a Delta and a CoreXY.
Putting the Z bed motor on a separate port and operating it by gcode will work - then do some magic at each layer advance.

Deltas do have good speed, and are pretty precise if arms are operating aroud 45 degrees.

Anyhow, curious if the firmware might already have logic to handle the extra axis

o_lampe

@x-stride I don't hink it's worth implementing this, as there is no good reason this concept goes "viral"

Disadvantages:

the rails for the delta can be shorter, but without any Z-motion they will wear out quickly
the bed mechanism of a CoreXY is usually slower and complex. You'll spend more money on it than you save for shorter Delta rails
how would you calibrate the Delta

You can still find a workaround by calling the bed's axis "W" and postprocess the gcode files (replace all "Z" with "W")
You have to change the homing files and overwrite the z-height found by the Delta calibration.
No big deal, if you're familiar with the RRF universe.