'Extremely twisted gantry'

Printer friends:

Gantry twist relative to the center

Extremely high gantry twist: 275.195820μm.
You have significant scan/contact inconsistency which is indicative of mechanical problems, please investigate before resorting to software compensation.

Front left:    109.402063μm
Front center:  -92.896243μm
Front right:   -119.663804μm
Left center:   150.307270μm
Right center:  -47.533959μm
Back left:     275.195820μm
Back center:   162.460849μm
Back right:    87.200352μm

Gantry twist relative to the center

Extremely high gantry twist: 275.195820μm.
You have significant scan/contact inconsistency which is indicative of mechanical problems, please investigate before resorting to software compensation.

Front left:    109.402063μm
Front center:  -92.896243μm
Front right:   -119.663804μm
Left center:   150.307270μm
Right center:  -47.533959μm
Back left:     275.195820μm
Back center:   162.460849μm
Back right:    87.200352μm

Is this worth fixing? VC3.1 400mm bed OG beacon Rapido Max variance is around +0.18mm but it's only at the absolute extreme edges of the bed, most areas of the bed are circa 1.2mm variance. If this is worth fixing, what's the best way to go about it? I've cast my eye over the build docs again and remain a bit unsure..

9 Replies

TheTik•2w ago

https://www.youtube.com/watch?v=h7ZTq2dDTkM

3D Printers & a Whiteboard

YouTube

RatRig V-Core 3: How to Get a Square Frame

This video is for those who struggle getting bed meshed with their RatRig V-Core 3. Please feel free to jump to the chapter you are interested in. 0:00 Intro 1:05 about the v-core 3 frame and bed leveling 8:26 what to take care of in the building phase 9:17 the right square 10:09 build tips 16:50 adjusting the frame according to your bed mesh ...

TheTik•2w ago

Thats the best advice I've seen for this kind of issue. Take your time and good luck!

tomlOP•2w ago

Do you think the variance warrants it? 0.18mm over 400mm feels pretty reasonable to me given it's only at the absolute extremity. Wondering if I'll be able to improve it as all three contact points (z-tilt) are similar, which leads me to think the bed is potentially just slightly not flat.

TheTik•2w ago

Try printing and you'll get your answer. The end goal is to get good prints, so if you aren't getting nice first layers, or dimensionally acurate parts, then revisit error messages. The bed variance being under a layer height should be fine, but if the frame is twisted you may end up with twisted parts. Could look at the calilantern

tomlOP•2w ago

0.133mm max variance now with no real peaks, probably going to call it a day there in terms of the bed being the issue

TheTik•2w ago

Seems good, happy printing!

tomlOP•2w ago

Thanks for the help again! 🙂

blacksmithforlife•2w ago

what did you do to fix it?

tomlOP•2w ago

Just what the video says. I have actually used the video before, but I probably did about 40 runs/tweaks this time. It’s kind of hard, need some jack screws really. I remember I was going to design some at one point. Little screw lifts that allow you to make micro adjustments between runs and can then be removed permanently. Maybe one day… But I wouldn’t class it as fixed - I now have too much variance in probing for the beacon calibration to complete. I just think the bed is probably not at issue for the twist now?

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'Extremely twisted gantry'

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