Bambu 95A HF TPU on the A1

[Elothan]

How have your experiences with the Bambu 95A HF been on the A1?
I picked up a roll, and it seems to give me constant under extrusion, while regular TPU prints like a dream.

I know the volumetric flow rate in this is higher, but I sort of thought Bambus own profile would yield a bit better results than it does.

Its dried, running of the external spool holder (modded to use bearings for less friction), using a hardened 0.4 nozzle.

It’s probably just a matter of slowing it down a bit, but I figured I would hear some of yours experiences with it, to see if I can keep the decent speed boost it should provide.

[Josh-3D]

@MalcTheOracle might have some insights.

Maybe the hardend nozzle? I’ve heard that can cause troubles, and I think Malc might know better. I’ve printed a bunch of the Black HF TPU that bambu sells on my A1 Mini, without any issues. I use a regular nozzle, not a harden steel one.

Which brings me to the next question. Is it just the yellow hf tpu? Or have you had/been able to try that with their other colors?

[MalcTheOracle]

@Josh-3D is correct, I had the exct same issue.

TPU poor quality issues with hardened vs stainless steal hot-ends

I have noticed a significant quality issue when printing HF TPU, and you have a hardened steel hot end installed. HF TPU using the Bambu TPU 95A HF filament setting: Stainless steel hot-end = great quality Hardened steel hot-end = poor quality The problems include uneven layers, and rough to the touch top surface. Close-up of two TPU straps printed on the same printer, the only difference being the hot-ends. Left = Stainless steel Right = Hardened steel [IMG_3919] I am not necessarily …

I explained the testing I had performed in detail and how TPU had a really poor quality when printed using a hardened steel nozzle on the A series (both A1 and A1 mini).

If I swapped back to the stainless steel nozzle, everything worked perfectly.

I was going to perform additional tests, but, I haven’t yet. I may do some tomorrow (it is 11 pm here) as I would like to know if anything has changed since.

I still have both nozzle types and lots of lovely TPU to play with.

I only have the A1 mini now (the recall took the A1 and P1S combos (many) replaced it).

In my first tests, the A1 and A1 mini had identical outcomes. The same should be true now.

BTW, speed did not affect the outcome. Nor did High Flow vs traditional TPU. The filament supplier also did not matter.

[Elothan]

Hmm, I can give it a try tomorrow (Midnight here now), but all other TPU prints without issues with the hardened steel nozzle.

[MalcTheOracle]

It is possible things have changed since I last tested it, as I said, I will try again tomorrow, fingers crossed aBS update has changed things.

I do not have any Bambu Lab TPU, my HF is from Overture.

[Elothan]

Only have the yellow hf from Bambu, my other TPU is from other manufacturers, and not hf.

The picture is not a too layer, just walls

[MalcTheOracle]

@Josh-3D and I want a contest related to TPU.

We both have stocks of TPU, but, the lack of models that truely exploit the material in MakerWorld is disappointing.

A contest might spur the community to really explore what can be done with it.

I have a TPU-only project due, a useful and practical print (shocking, I know, me and practical).

@Elothan

The picture is not a too layer, just walls

You do like walls!

[Elothan]

Had the strength profile on by accident

TPU is probably one of my favorite materials, and I often incorporate it into my designs, but I agree it’s under utilized in general. A contest would be fun!

[Elothan]

So I did a test with the stainless instead of the hardened, no change, neither did slowing down.

I am starting to think this particular A1 is cursed, nothing but issues with it.

[SJChannel]

Check the diameter of your filament, and you may find you have a bad batch of it. I have been having very frustrating under-extrusion problems with the Bambu 95A HF TPU on an X1C, after a few prints that came out fine. In the past two days it has progressed to the point that I can’t even get it to load properly. Finally this morning I used a precision caliper to measure the diameter of the TPU. Instead of 1.75 mm ± 0.03, it measures only 1.14 mm. No wonder the extruder can’t grab it reliably. Just to double check, I measured some PLA with the same calipers and it came out almost exactly at 1.75 mm. I should add that my TPU has undergone at least 24 hours of drying, and it has been either in the dryer or vacuum packed with dessicant ever since it arrived. I’m going to ask Bambu to send me a new refill of the stuff.