Delta Arms Too Short on V2?

[jckrieger]

I've had 2 prints fail recently and I've discovered the root cause. The cheap skates bottom out and cause the belt to slip before the extruder reaches the perimeter of the build platform. Are my arms too short? Can the V2 not really build the full 11"? Let me know what's going on!

[jckrieger]

I've been doing some troubleshooting and noticed my cheap skates were loose. These were adjusted very nicely during the build, but after 2 days of print time all 3 were sloppy. This caused quite a lot of effector wobble. This probably isn't related, but I'm trying to read everything I can to ensure I can get consistently good prints... without crashing the cheap skates into the bottom plate!

[bot]

Umm, are your arms blue per chance? How long are they actually?

[jckrieger]

Umm, are your arms blue per chance? How long are they actually?

The arms are black. 269 mm center to center distance. Is this about right? I should look in the EE prom data and see if that's how it's configured. That'd tell me if the arms match the firmware.

[bot]

That's right. I remember somebody else having a problem with their carriages falling to the bed, but the solution they found eludes me at this moment. I'm thinking maybe their belt wasn't routed correctly, or something.

[jckrieger]

That's right. I remember somebody else having a problem with their carriages falling to the bed, but the solution they found eludes me at this moment. I'm thinking maybe their belt wasn't routed correctly, or something.

I don't think it's belt routing, because even if I manually move the carriages by hand I notice that the nozzle doesn't reach the 11" perimeter between the towers. It's as if it can't reach by design. Here is a picture of the nozzle between the X and Y towers with the Z carriage bottomed out. As you can see, the nozzle falls about 5 mm short of the white line (11").

[img]http://i202.photobucket.com/albums/aa44/jckrieger/20141218_201255_zpsdd5d9a7e.jpg[/img]

Which leads to this when you try to print and the skate crashes into the bottom plate:

[img]http://i202.photobucket.com/albums/aa44/jckrieger/20141218_172307_zps09e64182.jpg[/img]

[jdurand]

My wife suggested it's a Halloween wig.

[jckrieger]

My wife suggested it's a Halloween wig.

I'm not sure anyone could re-print that even if they tried!

I re-squared my towers (they were slightly off from vertical) and the difference is not noticeable. The picture was taken with the towers re-squared. I'm really at a loss at why the printer can't reach.

[bot]

Oh, yeah my printer doesn't reach the line either. I'm not sure why people keep saying the build area is 280mm in diameter, it is more like 260mm MAX.

[Jimustanguitar]

That's right. I remember somebody else having a problem with their carriages falling to the bed, but the solution they found eludes me at this moment. I'm thinking maybe their belt wasn't routed correctly, or something.

The solution is just to decrease the printable area in your slicing and host software. Bot is about right with his 260 number. I think my carriages bottom out between 130 and 135 (radius) so that's where I leave them.

I have yet to check if the shorter V2 TrickTrucks allow you to increase this reach. I'll report back with what I find.