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Calibration getting worse, not better

I am trying to calibrate my pallet 2. So far I have done 4 Keychain, each getting worse as I go.

I have a direct drive machine with 75mm from the gears to nozzle. With other slicers I don't have some of the issues I am getting with the pallette. I have the pallette connected to octoprint and I'm running in Connected mode.

#1 just barely ran out of filament. I had the Bowden tube variable set to 80. I bummed this up to 100.

#2 completed filament but the middle part crushed and pulled apart. As if I had a major clog. I chalked this failure up to the filament. It wasn't the greatest.

#3 ran out of filament well before number one did even though I have increased the Bowden tube length in the settings. It also suffered from both over and under extrusion.

#4 I increase the Bowden tube length again, this time to 120. Again I ran out of filament well before it was done printing and suffered from over and under extrusion.

This is the ping from #4

201901MosaicKeychain1-2.mcf.aw.gcode

PING (%)

===================

Ping 1 96.29%

Ping 2 97.83%

Ping 3 98.11%

Ping 4 97.65%

Ping 5 98.92%

Ping 6 99.42%

All pictures are from print number 4.

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4 Answers

Hey @jd2112, thanks for reaching out about this. Could you attach a photo of the bottom of your transition tower for the keychain? This will help us assess if the loading offset (distance from Palette to the nozzle) calculated during the calibration print is accurate.

From the photos, it looks like your keychain print finished - was there leftover filament in the outgoing tube at the end of the print?

From your ping data, it does look like you are experiencing inconsistent extrusion. A ping of 97%, for example, means that your printer extruded 0.97 mm instead of 1 mm in that moment. The goal with pings is to have them within 1-2% of each other, and within 5% of 100. When the initial ping is significantly lower than the rest of the pings (as in the data above), this usually means the bed needs to be levelled. If the nozzle is too close to the bed for the first layer, it will cause filament to squish, which will cause under extrusion, that you can see reflected as a very low ping. We would recommend making sure the bed is level, and that your extruder is calibrated. We usually use this guide here for this.

It also helps to make sure that your setup is robust. Could you tell us what kind of printer do you have, and attach photos of your Palette and printer setup (with a focus on the filament path as it enters the extruder)? Thanks for your patience with this.

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I tried to respond to your questions. The bot marked it as spam.

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The keychain did not finish. I will upload a picture that may better show the lack of filament. There is no filament in the tube.

The bed is level and the esteps are correct. I do not have this issue when I am not using the palette 2. These issues are only showing up when using the palette 2.

The machine is mainly an Anycubic I3 mega that has a BTT SKR V1.4 Turbo board and is now a direct drive with a Bondtech BMG.

I will include pictures from the palette 2 to the hot end assembly.

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This picture contains prints 1, 3, & 4. I have marked with a black marker where I ran out of filament.

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Jim Smith will be eternally grateful.
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