My new print head with the hotend as a functioning z-probe.

My new print head with the hotend as a functioning z-probe.
Model is here if anyone is interested:
http://www.thingiverse.com/thing:189393

On the software side, I still can’t figure out how to run a succesful auto-leveing. I have the latest Marlin. Starting at the home position, when I try G29 only the Z carriage will go down until the rods disconnect. When I try G30 all carriages go down until z-probe is triggered, and I get this :

Bed Position X: 0.00 Y: 0.00 Z: 293.01
echo:endstops hit: Z:293.02

Which doesn’t make sense, because it should be around 520mm.

Any ideas what is going on?
https://www.youtube.com/watch?v=1t-o9N980OQ

Nice idea, I was thinking on similar lines.

Nice idea, but are you able to get keep the nozzle static on higher accelleration rates and speeds? I also thought a bout something similar as we have a similar hotend mount but dropped it due to doubts in the stability of the nozzle tip.

For autolevelling on delta printers try repetiers firmware - i think he’s quite far on the development road on this.

Probably software endstops. You have to change the value in the firmware. Keep in mind that after the G29 is complete you need to check the nozzle distance at Z0. If it’s too high then do G29 Z-(whatever distance)

By the way are you going to do this before each print? If so, heated or not heated? How do you plan to clean the nozzle tip every time?

@John_Ecker_GeoDroidJ what do you mean software endstops ? Change what value ?

@Shachar_Weis most firmware come built in with built-in endstops that basically know how far they travel and stop automatically.

The printer is already calibrated and printing. In fact, this new yellow print head was printed on this very printer. I’m just trying to get bed leveling to work, and I don’t understand why it only moves the Z carriage when I try G29.

Now that I think about it, it seems to think it’s a Cartesian bot…

@Shachar_Weis if you haven’t changed it, it surely thinks (by default) it’s a cartesian bot. I don’t know if there’s auto leveling for Deltas within Marlin but it surely is in Repetier Firmware.

@Helmi the printer works, so obviously it knows it’s a Delta. I guess G29 on a delta is not supported or broken. I’ll look at Repetier, although the thought of starting over with a new firmware is daunting.