I print a lot of tpu for a part I sell that unfortunately has a rounded bottom that needs support. I finally got mine looking as good as tpu will probably get. The biggest difference I see in support is I use default instead of snug. Also I run a 0.2 layer height. This worked better for me than thin layers but I don’t know why. Thin layers became wavy on steep overhangs. It could be because the thin layer on a high overhang is less rigid than a thicker layer or because of volumetric flow rate a 0.1 layer is printed much faster than a 0.2 layer. The print head moves faster the thinner the layer is.
1 Like
Appreciate the reply! On that handle I posted I actually did 0.28 layer height on that one since someone told me that the thicker layer height will prevent curling more, and thats the result that I got. When reading online regarding edge curling it seems to be a mix of cooling and layer height. My fans are at 100% and I have tried 0.16, 0.2, and 0.28 layer heights all of which end up having edges curl that propagates upwards into a big gouge.
Another issue I am having is when printing benchies for test purposes, there is a stark difference in the print surface along the volumetric flow change boundary. In the following screenshot the darker color is a slower flow rate:
In the real benchy the same thing can be seen where the slower region has a wider extrusion width than the previous. This happens at every point that there is a change in volumetric flow.
Not sure what to do about this one aside from limit the flow to a point that nothing in the print can be faster, but with priline people in my group are printing at 6-7mm^3/s without issue.
I prototyped with some older sainstart tpu 95a that I had and it printed great. I need uv protection so I went with polymaker 95hf but switched to sunlu 95a because the cardboard spool gave me issues in my dryer. All 3 of them have printed the same and I finally got consistent prints at 2.6mm^3/s even though the 95hf stands for high flow and is advertised to print at 100mm/s.
Try to slow down all the speed settings.I noticed the first and outer layers are 50 or so.
Why do you speed up to 200 and more on the other layers? Maybe support will print better slowly…
One thing I may have missed when skimming through, so excuse me if this was asked. Are you using a hardened steel extruder / nozzle? The stock P1 extruder / nozzle are NOT recommended for TPU.
I read a lot of posts on this site claiming that TPU is difficult to print. I bought a roll of inland TPU and on the third print was able to print this dust adapter for my vacuum.
This was done with all standard settings on a P1S, not using the AMS. I printed it on blue painters tape because others said they had issues with the stock build plate.
1 Like