I am trying to print a part which is an assembly from 2 different filaments on an A1 mini with AMS. The filaments are PLA and TPU and both print fine independently at the correct nozzle temperatures for each (yes the TPU is fine). When I try as an assembly the first layer of PLA (220° C) is fine but on material change the nozzle temperature rises to 230° C and stays there, the result is the TPU will not purge.
Can anybody please suggest a setting in Bambu Studio or how to hack the gcode to increase this ‘hold’ temperature to 250°C?
Filament change uses the Filament Min/Max temperature settings. So you may want to increase the max temp value of your PLA in the Slicer to the min value of your TPU. Be careful though. Setting it too high may lead to an increased likelyhood of clogging.
Getting good results when using TPU and PLA in the same print is possible but hard to achieve. I would suggest designing some snap-fit joints and printing both parts separately, which would enhance not only your part’s strength but also their accuracy.
It works for me when combining BVOH with PLA and PETG. Haven’t combined with TPU (yet) but can imagine further issues arising for example during purging. Like an extruder clog when pushing the PLA out with TPU.
That may also require the use of the Multimaterial parameters currently only available in Orca to slow down the purge when pushing with a flexible filament.
Orca and Studio are children of the same slicer offspring. Orca is non-commercial, has a bit of a development lead on Studio and is available via github. Studio tends to follow Orca on quite a few of their leads. I suggest you have a bit of a browse in the forum for Orca as I am not so well versed in the details but others here have a very good insight.
For your particular question, Orca has an entire tab in the filament settings where Studio has … none… (yet).
BVOH is a water soluble material. So it serves the same function as break away support or PVA. My own experience with break away support and PVA however, …, well they led me to try BVOH As PVA, it does need to be very well dried, temp settings need to be tailored to the filament it is intended to support (like in your original question) but then it works very well with PLA.
However, I have not yet tried the dissimilar material support (i.e. PLA supporting PETG and vice versa). It seems to be quite popular in the forum.
So tried your suggestion to increase Filament Max temperature and that seems to work! Sorry I got confused and thought that was iChris suggestion.
While printing test part noticed minor design error so will correct that and then try proper print.
As a side note, Bambu warns against using TPU in an AMS. It’s too soft to push through in most cases. It also crushes in the feeder gears and becomes wider–Compounding the feed problems. I only use TPU on an external feed roller. This means manual feeding, of course.
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As PVA, it does need to be very well dried, temp settings need to be tailored to the filament it is intended to support (like in your original question) but then it works very well with PLA.
