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What can I do about a not flat bed (original robox)

Daniel
(@danthekilla)
New Member

Most of my prints fail as the bed is not flat, some areas are about 0.4mm higher than the rest which causes no material to get extruded in those areas and then way too much material to get extruded in the area right after the high spot (due to built up back pressure). This makes most of my prints fail, unless I constantly change to 50% extrusion speed on the high areas every time the head prints in those areas, then I get about a 70% success rate.

Any ideas on how to flatten the bed, or should I replace the bed? Does the robox support mesh bed leveling?

Quote
Topic starter Posted : 11th October 2021 3:59 am
BHudson
(@bhudson)
Former USA Robox Support Moderator

@danthekilla The Robox does mesh bed leveling, which is why it does the 9-point bed map before every print. If your bed is out by that far, you have one of a couple of possible issues:

1. Mechanical issue with the Z drive causing the movement to not be measured accurately. This is usually due to a lack of cleaning and lubrication. Instructions to do this are on the support site. 

2. The PEI bed sheet is warped. Where on the bed are your high/low spots located? When you push on the bed in the center does it flex or is it tight against the heat plate underneath?

3. The first style Bowden tube could sometimes cause inaccurate bed mapping in certain conditions. If you have not upgraded the Bowden tube to the metal bracket version you may see a thinner first layer on the right side, but it should not be out by 0.4 mm. 

ReplyQuote
Posted : 12th October 2021 4:09 am
Daniel
(@danthekilla)
New Member

@bhudson I doubt its the first issue, as I haven't really used much. Maybe 15 hours of printing since I got it back from you guys doing the bed replacement, and only a few hundred hours prior to that.

It is an original model if that makes a difference. I never used it much because I have always had so many problems with it.

There seems to be significant deflection when I press moderately (about 800g of force) on the high spots across the bed.

ReplyQuote
Topic starter Posted : 12th October 2021 5:39 am
BHudson
(@bhudson)
Former USA Robox Support Moderator
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