Thank you for reaching out to us!
Printing flexible materials can definitely be tricky and honestly, one of the best things of advise I can offer is to start the prints slowly.
I Personally first started at ~10mm/s across the board to familiarize myself with how the material reacted with my Pulse XE.
The first rule in printing with flexibles is DO NOT use retraction, make sure that is disabled, this can cause a mess.
Second is, Keep the material dry: Flexibles are inherently very hygroscopic and will absorb moisture very quickly so using a print dry in tandem with your prints would be ideal.
Since you are new to printing with flexibles, I have also included an in-depth article we have written on how to succeed when printing with flex materials which I believe would be advantageous to take a gander at below:
- I guess, I have to set 1.73mm to 1.75mm, but I'm not quite understand, how this setting actually affects printing, because previous material NylonX also 1.75mm printed good quality with this default setting 1.73mm:
This is a standard-setting and is deviated slightly just to accommodate any possible slight diameter variations in the material. The software accounts for that automatically with that setting. It ultimately affects the extrusion of the print, very slightly.
3. I've never used TPU before, and model requires supports. I'm not sure, how to set supports for TPU, I can't imagine how TPU behaves with using of supports, since the material is elastic:
Supports can and will be tricky. Generally, the stock settings in the supports should do well but since every machine is different and that comes with variables, you will need to run through some trial and error.
I hope this helps start you in the right direction in your flexible printing adventure. Let me know if there is anything else I can do to assist!