I have a CR-10, which is a bowden setup which is not the best so I'm a bit concerend about trying to get it to print tpu, seems like it would take hours of adjusting. Can I print antenna holders / things in normal pla? Does it have to be flexible?

I have the Creality ender 3 pro. I was told just adjust the retract distance is about the only change from TPU and that is done in Cura so nothing done to the printer itself.

Prints TPU fine. I am still playing with the setup as my prints are a bit stringy in TPU but still very useable. Nothing bad enough that a quick flame over with a cigarette lighter doesn't sort out

If you haven't done so already consider joining https://into3dp.com/. Dave is a god when it comes to 3D printing so he will sort you out.

Basic setting I was recommended to use are

Once you go to custom settings, my recommendation is the following basic settings:
Printing Temperature: 220C (this is generally my favourite place to start)
Bed Temperature: 60C
Enable Retraction: ☑
Retract at Layer Change: ☑
Retraction Distance: 4.5-5.5mm (Key to raise this to 7mm for TPU)
Retraction Speed: 45mm/s
ZHop when retracted: ☑

I use this 3d print direct drive on my ender 3. Works perfectly for TPU prints, best mod I've done so far.

https://www.thingiverse.com/thing:3589452

You need to lengthen the extruder cables because it mounts the extruser on top of the hotend and moves up with it. I'm curently doing the first petg print since the mod, I'll know in a couple hour's if this causes any ringing or ghosting at petg speeds.

(05-Nov-2020, 03:59 AM)UrbanJungle1966 Wrote: I have the Creality ender 3 pro. I was told just adjust the retract distance is about the only change from TPU and that is done in Cura so nothing done to the printer itself.

Prints TPU fine. I am still playing with the setup as my prints are a bit stringy in TPU but still very useable. Nothing bad enough that a quick flame over with a cigarette lighter doesn't sort out

If you haven't done so already consider joining https://into3dp.com/. Dave is a god when it comes to 3D printing so he will sort you out.

Basic setting I was recommended to use are

Once you go to custom settings, my recommendation is the following basic settings:
Printing Temperature: 220C (this is generally my favourite place to start)
Bed Temperature: 60C
Enable Retraction: ☑
Retract at Layer Change: ☑
Retraction Distance: 4.5-5.5mm (Key to raise this to 7mm for TPU)
Retraction Speed: 45mm/s
ZHop when retracted: ☑

Thanks for the mention Urban : Definitely come to into3dp if you want more help. 

Also with TPU, I recommend you lower your print speed from the standard 50mm/s to around 35mm/s for a start.

And you will generally get curling on the base of the print, I recommend using glue stick for bed adhesion with TPU and this should go away.

You will likely have issues unless you use SainSmart TPU. I've tried about 8 other brands now and not had as good of a result.

You will always get stringing with TPU. It's almost impossible to avoid and you just have to accept that you need to do some post-print cleanup of TPU prints if you want them to end up looking really nice. After cutting/pulling off any strings I then use the hot air gun from my soldering rework station set at 210°C to melt back and tidy up any surface blemishes.

One slicer setting that can help to mitigate stringing is the option that stops the print head crossing perimeters. What this means is that when the print head needs to move to another area of the print it will follow the contour of an already printed section so that any filament that may be oozing out of the nozzle will be laid down on an existing part of the print as the nozzle moves over it rather than oozing out into thin air and creating a string between two parts of the print. It's still not perfect and makes the overall printing time a little slower but I find it helps to reduce some of the post-print cleanup required. I don't know what the setting is called in Cura but in PrusaSlicer it's the "Avoid crossing perimeters" option under the "Layers and perimeters" section in the Print Settings tab.

In cura that's combing mode in travel menu. This works good to reduce stringing i generally keep this enabled. In shell menu optimize wall can help reduce retractions and playing around with z seam alignment options can help reduce added time when using combing mode.