Rat Rig Community [Unofficial]•3w ago

Bed compensation is not working

Hello! I have noticed the after I start the print job, bed compensation is not activated. I am using a S3D slicer, I have copied and pasted start and end scripts from ratrig page. Is this something missing in start script o something is wrong in the printer's config files?

19 Replies

armearme.OP•3w ago

@miklschmidt maybe it has something to do with the fact that I am using contact beacon mode? 😄

miklschmidt•3w ago

bed compensation is not activated

How do you figure?

armearme.OP•3w ago

Z axis screws does not move while printing a layer. But I actually have another more important question at the time: communication timeout during homing - is this something physical with the cable itself? or might be something else?

miklschmidt•3w ago

Put a piece of tape on them, and make a little flag, they move 🙂

communication timeout during homing - is this something physical with the cable itself? or might be something else?

Depends on the actual error, timeout is usually a host overload / resource issue.

armearme.OP•3w ago

what do you mean "actual error". Where can I see it?

miklschmidt•3w ago

If you couldn't see it how did you know you got a communication timeout? 🙂 Just screenshot the error, or upload a debug zip after it's happened.

armearme.OP•2w ago

here it is

ratos-debug.zip

armearme.OP•2w ago

and as for the bed mesh, something is clearly not working, first layer is far from even. Some areas are too close, other are not.

miklschmidt•2w ago

If everything is updated (especially the beacon module), this is most likely a wiring issue yeah, or you have a loose connection in your USB ports etc. I'd need to see the results of BEACON_RATOS_CALIBRATE sounds like axis twist

variable_beacon_contact_z_homing: True                 # Make all G28 calls use contact instead of proximity scan
variable_beacon_contact_bed_mesh: True                 # bed mesh with contact method
variable_beacon_contact_bed_mesh_samples: 2             # probe samples for contact bed mesh
variable_beacon_contact_z_tilt_adjust: True            # z-tilt adjust with contact method
variable_beacon_contact_z_tilt_adjust_samples: 2        # probe samples for contact z-tilt adjust

variable_beacon_contact_z_homing: True                 # Make all G28 calls use contact instead of proximity scan
variable_beacon_contact_bed_mesh: True                 # bed mesh with contact method
variable_beacon_contact_bed_mesh_samples: 2             # probe samples for contact bed mesh
variable_beacon_contact_z_tilt_adjust: True            # z-tilt adjust with contact method
variable_beacon_contact_z_tilt_adjust_samples: 2        # probe samples for contact z-tilt adjust

Are you using a glass bed? you're using a 6x6 mesh... that's not gonna do much, if you have lots of inconsistent bad spots.

armearme.OP•2w ago

Yes, glass bed, 6x6 mesh. For example, I have printed a small part now (picture of mesh is below) and first layer looked exactly like this small mesh - on the left side nozzle was too far away, on the right side it was good/maybe a little too close. So basically it does not compensate anything.

armearme.OP•2w ago

How do I send you all the results? debug.zip? I have made a beacon ratos calibrate, there is bunch of info

armearme.OP•2w ago

Okay I can not do a beacon calibration

armearme.OP•2w ago

Okay I have this info:

miklschmidt•2w ago

Tons of mechanical issues You have axis latency (there's is noise in your setup, wiring issues), you have >120 microns of axis twist and you're not getting consistent probing results.

armearme.OP•2w ago

Are there any tutorials on how to fix these issues? 🙂 Also, I will try to run the same calibration without glass and not with contact beacon mode, maybe something will be different

miklschmidt•2w ago

There's no easy way, start inspecting. You can run the individual parts of the beacon calibrations one by one. The poke test will check electrical noise. The gantry twist measuremennts will show you how parallel your gantry is in Z (or how poorly your glass bed fits on the metal beneath it). The inconsistent probing is because something in your z axis is moving when it's not supposed to, so something isn't rigid or something is loose. Start by finding and solving the inconsistent probing it can be everything from hotend wobble to loose z couplers.

armearme.OP•6d ago

so the "Beacon_ratos_calibrate" is a series of tests that show how well or bad the printer is assembled?

armearme.OP•6d ago

What about now?

miklschmidt•6d ago

That's sort of the side effect of it yeah, it can be used to analyze a whole bunch of things, so we do 🙂 significantly better Still some twist (around 80 microns in range now, so much better), but this could just be you flex plate, a bed mesh would help diagnose further It's possible your umbilical is tugging on your carriage at the front (say, if it's not quite long enough)

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Bed compensation is not working