Hello everyone
Does anyone know the maximum weight allowed on the print bed of a P1S? I started a print and paused at about 150 grams of filament on the print bed. Then I added weight (360 grams). So, there was a total of 510 grams on the print bed. Then I ran the print again. Then it looked like the print bed was too deep and the layers weren’t bonding. I had to abort the print. Was that too much weight, or what could I have done wrong? Thank you in advance for your help.
I very much doubt that it was the weight itself. The P1S is pretty stiff and 360g is not a lot.
Taking time during a pause (cool down shrinkage) or geometric changes due to additional features can easily explain debonding. As could accidental slippages during the weight addition.
But we’d need a better understanding of the model, print, added features, failure pics, etc.
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Here are a few photos of my failed attempt. You can see how the layer no longer adheres after the pause… I printed it with dried Bambu PETG HF. The pause for adding weight lasted about 3 minutes. Thanks for any further help.
Many thanks for those pics. It is still a bit of a puzzler though as a 3 Min pause is, in my peronal experience, not enough to cause major issues.
Two other items come to mind though.
First, the infill looks somewhat strained on lower layers already. So you may want to print slower anyway. In my experience, PETG rewards slower speeds wirh improved layer adhesion and print quality. Either reduce print speeds or reduce flow for a better infill. You can also use honeycomb to have a better feel for when you are pushing flow limits.
The second is the weight material. Using iron weights, these will act like massive heat sinks in the print which in itself could explain the subsequent layer separation. I believe that the magnetic effect when placing the iron in the print to probably be negligible (you would have felt it when placing the weight).
So you could try to use weights with lower thermal conductivity (no powders! Cast and hardened concrete or gypsum may work well for your application though) and/or manually increasing the nozzle temp for the post-pause layer only (!) by 10°. And take that particular layer at a 50% speed to improve bridging.
Hope this helps a little,
& 
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