N2 plus poor quality

DeX
Posts: 158
Joined: Fri Apr 21, 2017 6:56 am

N2 plus poor quality

Postby DeX » Tue May 28, 2019 3:05 am

My first prints with the plus printer. So many wobbles :(
:roll: need help!
Had reduced jerks and accels in a half. Had change speed, flow rate(extrusion), temps...4x4 bolts are untighten. Printer is used but looks like a new. Not much printed.
Upd. Under the bottom is everything OK. (z stepper, coupler..)
Nozzle - new stock.
Attachments
IMG_20190526_073539.jpg
IMG_20190524_085017.jpg

DeX
Posts: 158
Joined: Fri Apr 21, 2017 6:56 am

Re: N2 plus poor quality

Postby DeX » Sat Jun 22, 2019 7:49 pm

How is your n2plus prints full height?

Jetguy
Posts: 2797
Joined: Tue Mar 22, 2016 1:40 am
Location: In a van, down by the river

Re: N2 plus poor quality

Postby Jetguy » Sun Jun 23, 2019 1:40 am

See how the banding near the top also matches the ball screws that raise the bed? That's your giant hint to what is contributing to the Z stage wobble as it moved down the taller the object is, the more the wobble amplifies.

The factory original method of leaving the 4 each screws and nuts loose so the ballnuts can slide compared to the Z stage is not super effective at decoupling wobble.
#1 ensure your ballnut attachment screws and locknuts are intentionally loose. Also consider lubing or greasing the sliding point between the flange of the ballnut and the actual Z stage.
#2 Consider alternatives to the loose bolt method.
https://forum.raise3d.com/viewtopic.php?f=5&t=9804
https://forum.raise3d.com/viewtopic.php ... ble#p33244

Another factor people may miss, hotend PID calibration and tuning can affect printing. Becauee the hotend changes temps and cycles, that causes banding of a different frequency.

The fact is, that Raise 3D has always had a weak Z stage design. Long round rods is NOT how you create a wobble free Z stage. Very few leadscrews are perfectly concentric and straight before the printer is assembled, let alone shipped and abused. You can bet the bank on nearly every printer ever sold, there is some wobble at the leadscrew somewhere. The KEY is properly engineering the nut to bed interface and properly designing a supported linear bearing way that is frame connected the entire path NOT 4 round rods only connected at the ends.
Again, the idea is assume there is wobble at the leadscrew, the interface from vertical motion cannot couple horizontal wobble. A sidling joint is not ideal or the answer. Worse, the linear stage has one job in life- ensure the Z stage moves in a perfect smooth straight path vertically and resists wobble. Unfortunately, no matter how large and heavy duty you think a 12mm rod is, spanning a moving build area of 24 inches meaning the rod is LONGER than 24 inches and only mounted to the frame at the ends pretty much means in the middle, slight pressure can flex the rods significantly (in comparison to a 0.4mm nozzle, how must deflection do you need for vertical wall error to be visible??).

DeX
Posts: 158
Joined: Fri Apr 21, 2017 6:56 am

Re: N2 plus poor quality

Postby DeX » Sun Jul 07, 2019 8:57 pm

Thank you for explaining!


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