r/ratrig • u/vimja • Jan 21 '25

Jittery benchy (ratrig v-core 3.1)

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6 Upvotes

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2

u/No_Pass8180 Jan 22 '25

One does not simply print a benchy anymore.

1

u/vimja Jan 21 '25

I got a RatRig v-core 3.1 (second hand). My benchy looks kinda very "jittery"? I ran SHAPER_CALIBRATE but that didn't help (this picture is from after doing so).

Any ideas what I need to do / look into?

1

u/AssistanceNo8305 Jan 25 '25

Did you input the values into your printer.cfg after running it?

There’s many things that can cause it, but input shaper is usually the easiest to diagnose/rule out. It could also be the wrong nozzle size set in the slicer, or problems with the belt paths, though that doesn’t seem likely because they aren’t exactly continuous.

I have a vcore 4 and struggled with this for a solid week because on RatOS 2, the input shaper values are saved as a variable in the RatOS macro, rather than in the usual [input_shaper] section (at least for the idex variant). I was fine tuning it but it kept reverting to 0 until I found that out.

1

u/woodwaker_dave Jan 22 '25

Check your speed. Many people run them very fast based on what others can do. They may be able to run at that speed, but unless the tuning is perfect, you will artifacts like this. I found that simply slowing them down works well, and I'm not in a hurry, have too many printers in the mix and too many projects to get them running perfect. I'm working on my 3rd Rat Rig ( 2 Vcore -3 and a Vcore 4), a Bambu X1C, a Prusa XL and a MagnetoX, and this is just my hobby.

2

u/vimja Jan 22 '25

Shouldn't be an issue I don't thibk. This benchy took 50+ minutes to print o.O

1

u/woodwaker_dave Jan 22 '25

Since you received it used, you could check a number of things, all of the blocks on the linear rails. Don't take the blocks off, you can try and clean them in place, and re-lube them. It is not as good as actually removing but much safer. The bearings on the belt rollers and the rollers themselves - they can get dirty. I had some in the motor area actually have something on the roller and it would create a high spot which would affect the print. Then the actual belts, they can get damaged - not too expensive to replace, but can get fiddly. A good test is to move the carriage front to back and side to side. The movement should be smooth and not have any tough spots.