I tried that, but after a day of printing, prints started to show signs of wet TPU with a RH of 40%. How are you doing that in Florida? Are you changing out your TPU between prints?
I havenāt had any troubles. But my A1ās are the closest printers to my large room dehumidifier that runs 24/7. Still have 40% humidity in the room, but the filament doesnāt soak it up instantly.
I have been using the HT AMS just as you almost in the same config just a little closer to the printer and aliened with the inlet port. I found this on makers world https://makerworld.com/en/models/2705683-v2-ams-ht-desiccant-storage-tpu-spool-riser#profileId-2999150 it helped with the resistance. I also had to dry my TPU for 18 hours. I am using Bambu 95a HF. no issues printing for 32 hours. I also have a Humidify sensor in the HT I can see the values with Home Assistant. I was able to say under 10% for the entire print.
Iām in FL too and the house seems to sit at 45-50 RH which is HVAC industry standard. If it rains it does go up until the AC can catch up.
I want to print from my drier so Iām hoping the TPU assist module fixes the under extrusion and I will do a cold pull before swapping to TPU
I know there have been issues with people printing from a drier that is drying. I donāt know if the issue is heat creep or if the warm filament is to soft so the extruder has challenges. If the drier maintains a low RH and the dryer is off, I think that works great. Has been working great from my dry box.
I havent made a drybox yet, but I suspect I will need to. What do you have as far as a dry box?
looks home made
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Yup, I found this on Makerworld:
https://makerworld.com/en/models/215704-dry-box-cereal-box-spool-hygrometer#profileId-234889
I happened to have a few 608 RS bearings just lying aroundā¦![]()
Then one of those cereal boxes everyone keeps 1 kg spools in.
Then I printed a PTFE connector:
I use these on a lot of my other printersā¦
https://www.printables.com/model/322208-ultimate-spool-roller-v2-21cup-dry-box-compatible
Goes inside one of theseā¦
I use a sealed Polymake dry box, now $27 on Amazon here: Amazon.com: Polymaker 3D Printing Filament Storage Box - PolyDryer Box for Continuous Filament Sealing and Protection, 3D Printer Filament Holder Compatible with PA Nylon, PLA, PVB, PETG, ABS, TPU 1.75mm 2.85mm : Industrial & Scientific
Now I get the cereal box reference. I was trying to figure out how a card stock box worked.
Iāll have to make one too
I take my hat off to you. (now where did I put my hat emoji?) Anyway⦠way to go. So glad you are here.
Thatās almost how I had my tpu setup
First time using 3dhojor tpu. I am nervous bc there seems to be a little more resistance to feed the filament than I am used to with geeetech. But 62 layers in and so far so good.
Heater off and feed and speed set to 50%
Muuuuch better just takes 6 hours for one
It did print without an issue. A full plate shows 21 hours and if I run it at 50% thatās 42 hours. Is that right?
I probably didnāt even need the TPU assist module and should have gotten a .6 nozzle
I donāt ever slow down to 50% If the volumetric speed is set correctly that will keep the speed in check minus the rapids maybe. But that shouldnāt be an issue on anything but an A1. Regular 95a with the Bambu 95a profile, 95a HS/HF and 98a I run on the bambu 95a HF profile. As long as I am not having any feeding issues then it works perfectly fine in my experience.
Iāll give it a try. Iām guessing my issue yesterday with with the warm filament.
@NWCC I havenāt done anything in regards to volumetric speed. Iām just using default settings
Right. And as long as you are using the correct profile, and your filament path is good, you should never NEED to slow down to 50%
Well something is wrong because I did a plate of 3 tires and I just pulled them off and they all separated at multiple layers when I peeled them off. They were also very stringy.
My one successful tire I printed at 10% instead of 15% so thatās also a waste. I had printed that one at 50% speed.
TPU is no joke. I did two cold pulls before loading the TPU and it was dried but stored in my AMS with 20% humidity.
Whatās really making me frustrated is that I canāt really sit down and figure it out. I have family coming this week, still waiting for the TPU assist parts, it takes forever to dry, and just life in general.



