Adjust tension on extruder wheels for printing very soft TPU?

yes, I understand. thank you!

One more thing I’d like to add. I use a Mac computer, and if you use the Softfever version of Bambu Studio and follow the instructions for flow calibration using the built-in calibration steps, you can use the following AppleScript to make it simple to perform the instructed calculations. If you’re not used to AppleScript on the Mac, just launch the Script Editor.app, paste the following code into an empty document window, press run and answer the prompts:

set FlowRatio_Old to text returned of (display dialog "Please enter current (old) flow rate:" default answer "0.98") as real
set ModifierValue to text returned of (display dialog "Please enter the Modifier value that you selected when you ran the test:" default answer "5") as real
set adjusted_FlowRatio to (FlowRatio_Old * (100 + ModifierValue) / 100)
display dialog "Your new Flow Ratio value:" & space & (adjusted_FlowRatio as text)

Nice that you did that, but it’s only a few seconds in a calculator app to determine new values.

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Fair enough. (I need the rest of this to post that reply, apparently)

Hello tmtymmotorsport,

can you please tell me with TPU (Shore) did you use on your picture.
I dry to print a TPU 60a on my P1S with 0,6 needle and i despair !

Hope to hear from you.

Regards
Chris

You quoted my reply, but I didn’t post that picture, so I can’t answer your question. However, I think trying to use a .6 nozzle with TPU on a Bambu Lab printer may pose some significant difficulties even for the most experienced users. Also, nearly all successful TPU prints that I’m aware of have been using filaments rated at about 95A shore hardness. I’ve used 85A Ninjaflex with some success, but only at fairly slow speeds.

Why would a 0.6mm pose difficulties? Nozzle pressures are lower than with a 0.4mm nozzle, which is your limiting factor with TPU’s, meaning it’s easier than a 0.4mm. Bigger nozzles make things easier with TPU, within reason.

Wawww Where did you find a transparent cover for your extruder!.. It should be original… absolutely!..

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I have some very soft 65a and 75a filaflex filament which I want to print, I have the A1, A1 Mini and X1C, I am not even going to consider trying to print it on the X1C. I have successfully printed these very soft filaments on an Ender 3 with a direct drive by printing extremely slowly and adjusting the tensioner spring to very light, so the filament is not chewed up in the gears. Has anyone successfully printed very soft materials on a Bambu printer? 95a TPU is one thing, flexible 65A is a completely different beast.

I am thinking of trying with the A1 with the filament loaded from the top it makes sense, use a very short piece of Bowden tube so I don’t have far to feed the filament in as it would be a nightmare trying to push through a long Bowden tube, I then intend getting access to the tensioner screw to hopefully mitigate the issue of the gears chewing up the soft filament by loosening that off significantly

I have printed a top mount spool holder with bearings to hold my TPU roll in place on my A1 and have not had one failure printing with 82A with standard generic TPU settings Bambu Lab A1 Mini Spool mount for printing TPU by Nonrev Creations - MakerWorld.