I’m getting there! First test print after moving to a different printer. Looks like over extrusion on the front, back looks fine. Hopefully the adjustments I make will help with the strap holes. I’m stoked that I made a complete print for the first time! lol
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Thanks to everyone for the feedback. It’s not perfect but it looks and feels 10x better. I’ll run the back cushion again and see if I can get some consistency.
Thank you and keep the knowledge flowing!
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That looks great! What settings did you end up with?
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Print speed of 30 mm/s
Retraction off
Print temperature of 210
Also went into the slicer and tweaked the bridging settings ( I had no idea this existed)
Ran multiple temperature towers until I got the best looking bridge. I still have a little sagging (3 to 5 strands). I’ll try to tighten that up when I get time.
For me, the cushions displayed a lot of blobbing and the bridges sagged quite a bit. To solve the blobbing (and stringing) I turned on the setting “Quality > Advanced > Avoid Crossing Wall” It takes a little more time to print but it makes a big difference. I also printed every cushion separately. To help with the sagging bridges on the bottom cushion I painted supports on the 2 horizontal slots close to the plate.
As for the harness and straps, I had several failures due to my filament so I printed each piece separately to avoid loss of material and time.
I hope this helps.
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Thanks for the feedback. I just read about the avoid crossing walls feature last night! I figured that it’s not auto selected to increase efficiency and save time with travels. I’m going to try that next as well. The back cushion is now my challenge. I’m going to see if I can get the ones I’ve printed covered and run it again this weekend. It’s literally the last piece to complete the chair. I’m bit of a perfectionist so these bridges and blobs are bothering me. Lol
Drying the filament now for another run at it.
Thank you for the advice!
CB
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I print mine with supports with Z gap top and bottom at .3. Seems to be working so far! I will try this on the next print as well.
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They aren’t perfect but man they are 1000x better than when I first started! I did hours of test runs using HS-TPU and ended up with:
Temp… 225
1st layer speed… 25 mm/s
Speed… 40 mm/s. I made all speeds except the first layer the same to provide an even flow throughout the print
Retraction speed… 20 mm/s
Retraction length… 1
Acceleration… 3000 mm/s ( this was a big one. It was set at 10,000. If the acceleration was set higher than 3000 on any parameter, it was reduced to 3000)
Avoid crossing walls: TURN ON! This stopped 90% of the blobbing. Since the nozzle was dripping during travel, the drips were getting stuck on the cushion like a spit ball. This hides the drips and stringing inside the cushion.
Fan speed… ON at 100%. I also turned the fan on inside the box at 50% and cracked the top open. You want the filament to cool very fast.
I hope this helps someone but your machine may run differently. All were printed on a Kobra S1 with the TPU feed externally from a Polymaker heated box.
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those look really nice!
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Tyvm!
People can say whatever they want about AI, but it helped me out tremendously. I uploaded photos of multiple failed prints and it gave suggestions on parameter changes after each run…that’s what I ended up with.
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lol - I used AI to find where “Avoid Crossing Walls” was in the Bambu Slicer….
I’ve only ever needed to use it once on a Vase I designed that had internal stringing.
I am struggling with printing the cushions, too. I’ve had 3 failed print attempts for the cushions. Will try your method next! Thank you for sharing!
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I am using this filament profile. I saved it in the slicer so I can pull it up for the TMT print.
https://makerworld.com/en/models/1045337-the-perfect-tpu-profile#profileId-1031040
It has been working extremely well for the tires and now the cushions. I’m printing the back cushion now. The seat worries me on the A1 since it is so straight, I’m worried about a slight wobble. I have acceleration at 4000, I’ll lower it to 3000. I have my fastest speed at 30.
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How long do the seat cushions take to print with those settings?
I love the idea of super clean prints, but I’m trying to keep a balance with time
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The smallest one takes about 7 hours, the mid around 14, and the largest 24 hours if I remember correctly.
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Are you printing the two seat cushions separately?
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Seat bottom - A1 - 18:09 I’ve added supports to keep it from moving since it is straight.
Seat Back - A1 - 18:26 No Supports
Headrest - A1 - 6:27 No Supports
Seat back finished this morning and it is good, those nearly horizontal holes have a little sagging, but acceptable. A little rough around the top edge. I’ll see if I can clean it up a little.
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Yes. I print all separately. I’m a little gun shy since I’ve had so many failures… lol
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I did all my testing on the headrest to minimize waste.
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Me too. lol
Just loaded up the CookieCad filament. Interested in seeing how this plays out.
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