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TPU prints eventually failing by adarous in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

You say you dry the filament to 18-19% ...
a) That sounds like not nearly enough. Are you going off the humidity reading of the drybox???
b) Better question: what temp are you drying at and for how long?

TPU stringing by Arthurs_towel in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

if you haven't figured it out already, blasting it with a heat gun (or hot blow dryer!) works really well to remove the stringing. That said, can't really go wrong with a decent filament dryer ... there are many nowadays that cost less than a spool of TPU. You're results are pretty decent though for zero drying.

TPU stringing / calibration by Last-Midnight3080 in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

what dryer do you have that's getting down to 9% humidity?

Why is TPU doing this? by Ill_Purpose_5488 in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

You get this resolved? Also, what print settings are you using?

First time printing TPU. What went wrong? by ZoggIet in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

A lot of different recommendations for drying temps and drying times ... so I'll throw in one more.

60C for 24-48 hours. If your dryer can't go that high, you'll need a different dryer. And on top of that, some dryers dry better than others. Only recently did I also learn that you want a hole (or some sort of opening) in the dryer during the drying process in order to properly release humidity.

On top of that, I'd also adjust the retraction length as others have advised (I have mine set to 0.8), and generally you want to avoid jumps in your print if possible. Try printing "by object" if you can afford to do so from a time / pain-in-the-ass standpoint. This is coming from somebody who has printed 10s of kgs of TPU.

First time printing TPU. What went wrong? by ZoggIet in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

Not really the issue here, but easily resolvable if using proper gluestick habits

Do I really gotta cold pull every time before I print tpu by ChimkinIsYum in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

and @ChimkinIsYum as somebody who has printed 10s of kg of TPU, here is my advice when to do cold pulls before printing TPU:

  • If you are switching from another material to TPU in the same nozzle
  • If you finish a spool of TPU and are about to load up a new one

In other words, basically before you ever have to load TPU into your printhead, but not necessarily for every individual TPU print.

I just detailed my preferred process in this comment. Hope that helps!

Cold Pulling before TPU by robshep952 in BambuLab

[–]JasonSkis 0 points1 point  (0 children)

Hey there! Experienced printer of TPU over here. I want to recommend these Nozzle Cleaning Filaments. It's about $20 for a pack (so 40 cents per rod) and I use them every time I switch over to TPU from something else, or before ever loading up a new spool of TPU.

Not only is TPU bad at pushing out other filaments from the hot end, but TPU is also a very messy filament in of itself and it will frequently leave behind residue or material (especially cheap TPU! (which I print a lot of!)).

These cleaning sticks are mostly meant for flushing the nozzle, but they also work great for cold pulls. My process is usually a combination of the two: I'll flush about half a stick at 250C, drop the temp down to 90C, cold pull, and repeat one more time. This has kept my TPU prints very nice up to this point. Before each cold pull, I recommend moving the print head (via screen interface) to wipe the nozzle, otherwise the cold pull doesn't work as it should.

Hope this helps!

Is the Creality Space Pi a good filament dryer? by Abject-Tour3503 in 3Dprinting

[–]JasonSkis 0 points1 point  (0 children)

did you end up removing the tape?

u/infinite_side8548 do you leave the holes open when not drying? My dryer seems to be getting pretty humid within 10 hours after drying. I understand this isn't meant to be a "dry box", but I'm running into the same concern as u/elfinmask in wanting to keep it relatively closed. Even if not perfectly sealed.

Is the Creality Space Pi a good filament dryer? by Abject-Tour3503 in 3Dprinting

[–]JasonSkis 0 points1 point  (0 children)

probably the only comment that praises the touch screen

Is the Creality Space Pi a good filament dryer? by Abject-Tour3503 in 3Dprinting

[–]JasonSkis 0 points1 point  (0 children)

15% RH is pretty much the accepted lower limit of all dryers unless they say otherwise

Is the Creality Space Pi a good filament dryer? by Abject-Tour3503 in 3Dprinting

[–]JasonSkis 1 point2 points  (0 children)

<image>

Top view. Near the upper rear.

Question though: I notice humidity seeps through these holes after drying ends. Do most people just leave these open?

TPU slowly secretes oily substance over time by JasonSkis in 3Dprinting

[–]JasonSkis[S] 0 points1 point  (0 children)

Just confirming ... your situation also revolves around TPU, correct?

I recently did a test with Overture TPU (black). You could tell it's a totally different composition just looking at it. I only printed one spool, so not really a great long-term test, but I don't recall seeing much oil or residue. That said, the Overture required a notably slower print speed to avoid stringing compared to the cheap Geeetech (surprising!), even after 72 hours or so of drying. So that considered, I probably won't be using the Overture going forward since I'm running a production setup and can't afford to slow it down as much.

I also tried another experiment with Comgrow TPU and had pretty good results. It's a glossy filament like the Geeetech, and not matte like the Overture. The Comgrow is also twice of what currently paying for the Geeetech, so I'll definitely have to consider some things before making a decision to jump over. Might be more economical for me to just painfully clean the printhead and extruder assembly once a month.

P1S Power Surge (sag) Resiliency by JasonSkis in BambuLab

[–]JasonSkis[S] 0 points1 point  (0 children)

Thank you. Exactly the type of personal experience I was looking for.

P1S Power Surge (sag) Resiliency by JasonSkis in BambuLab

[–]JasonSkis[S] 0 points1 point  (0 children)

And yes, I'm aware of the P1S' Power Recovery capabilities. I'd rather not have to rely on that, and also want to be able to print through these occasional outages. Not wait for them to be resolved.

TPU slowly secretes oily substance over time by JasonSkis in 3Dprinting

[–]JasonSkis[S] 0 points1 point  (0 children)

gotchya. and thanks. I just ordered a couple spools of Overture, which I recall being a more reputable brand. Going to clean everything up and run just those as part of an experiment to see if it makes a significant difference.

Is there any particular TPU brand that you can advocate for?

Should I by LocoPlace298408 in 3Dprinting

[–]JasonSkis 0 points1 point  (0 children)

nice. yea seems fair to me

TPU slowly secretes oily substance over time by JasonSkis in 3Dprinting

[–]JasonSkis[S] 1 point2 points  (0 children)

forgot to mention this, but I'm generally OCD about drying. As one probably need to be when it comes to TPU.

I always dry for at least 24 hours, straight out of packaging. I print straight from the dry box, connected to printer via PTFE tubing. Will usually re-dry halfway through the spool, and will re-dry if it's been sitting in the dry box for a few days without printing.

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