[Resolved] ABS print issue

[Volker Knobe @prefekt Germany]

I have a problem with the first layer when I print ABS.

The first one, tow layers have not the same diameter as the layers above (see attached picture).

I have try with raft, but the raft is not easy to seperate from the item.

 

Parameters:

Layer: 0,2mm

PrintSpeed: 100%

FlowRate: 93%

Temp: 230°C

Bed: 110°C

Material: Robox Tech Black - RBX-ABS-TCBK1

Printer RBX01

 

Regards

Volker

 

• This topic was modified 2 days, 2 hours ago by  Pete. Reason: resolved

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[BHudson @bhudson I have both RoboxDual and other Robox versions Arizona, USA]

@prefekt This may be due to a poorly calibrated print head. Have you calibrated the print head?

Also, please check to see that your PEI sheet is firm against the heat spreader below it - if you push in the center and the PEI moves up and down you will need to adjust the PEI and possibly the retaining clips.

https://robox.freshdesk.com/solution/articles/1000154870-is-there-any-bounce-in-your-printbed-

If you think that the nozzle height is correct, it may be that you are seeing the washout period - the software adjusts any unevenness in the print bed over the first several layers.

Also, look up “Elephant’s Foot in 3D printing”. This is where the first layer is overextruded to ensure a smooth, unbroken surface and ensure good adhesion. This may be part of what you are looking at.

I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben

[Volker Knobe @prefekt Germany]

<span id=”gt-res-error”></span><span id=”result_box” lang=”en”>I think the PIE is bent. I can push the PIE about 1-1.5mm down. What is the reason for a curved PIE?</span>

[BHudson @bhudson I have both RoboxDual and other Robox versions Arizona, USA]

@prefekt Please see the article linked below for the solution. It will give you the answers.

https://robox.freshdesk.com/solution/articles/1000154870-is-there-any-bounce-in-your-printbed-

 

I operate two Betas and four Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben

[Juan Barbini @juan15pablo Argentina]

PEI bed has a lot of advantages and I really like it. But a huge cons of this PEI bed is the bent issue. In my case, I could never straighten it perfectly.
For me Robox need a upgrade of the bed, the autolevel is great feature but limited by the bed. (Maybe greater thickness?)

 

Regards.

[Mike @17bt CHORLEY, Lancashire]

“For me Robox need a upgrade of the bed, the autolevel is great feature but limited by the bed. (Maybe greater thickness?)”

Anecdotal evidence suggested a thinner PEI sheet was favourable when PEI beds were applied to other 3D printers, but they also used adhesive, which needs less strength to resist a thinner sheet warping, so that might explain that.

However, adhesive brings its own issues re-bubbling of the PEI surface, and also would interfere with the printhead calibration process that CEL currently use for the Robox.

The bigger question is why the warping? Is it the clip details? Is it variances in the heated bed temperature over the bed area? Is it temperature differences in the PEI sheet, as it lifts away from the heated bed exaggerating the issue. A quick infra red pic suggests there are temperature differences across the PEI sheet, but not always where there is “bounce” or lift, and an infra red thermometer also reinforces this, so a 110ºC bed temperature setting can see just 46ºC at the front corners, with 76ºC at the middle front & 96-91ºC across the middle of the bed on my Robox.

So far I’ve read the most “stable” bed surface is a silicon wafer, which has excellent thermal properties, but these links might be of use.

http://robox.cel-uk.com/rbx01-acc-lbs.html

http://robox.cel-uk.com/robox/accessories/rbx01-acc-lbp.html

I posted this a few days ago, but it never got added to the thread, for some reason. 😕

• This reply was modified 2 days, 6 hours ago by  Mike.

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[Volker Knobe @prefekt Germany]

I have turn around the PEI an calibrate the print head.

The prints are now realy good.

 

Thank you for the hints

 

 

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