Filament Maker’s recommended Print Speed is 20-40 mm/s. Now what?  

RE: Filament Maker’s recommended Print Speed is 20-40 mm/s. Now what?

Not directly answering your question about speed adjustment but I've printed a lot of overture TPU with the generic flex profile in Prusaslicer with excellent results. Just remember to dry your filament thoroughly. 

RE: Filament Maker’s recommended Print Speed is 20-40 mm/s. Now what?

Posted by: @dan82

I’m using Overture’s TPU 95A Filament.  Prusaslicer does not show a profile, just its high speed filament.  Overture provides a list of settings for the TPU 95a, bed temp, nozzle temp, etc…very straight forward.  However, the print speed of 20-40 mm/s is not so obvious what to change in Prusaslicer.  As you know, there are numerous print speed settings for various operations in prusaslicer.   Also, Overture doesn’t offer a profile for Prusaslicer.

I’m hoping I can better understand the interaction of all the print speed settings…it would be nice to just adjust one master number and have the others adjust accordingly.

I would appreciate any help on this.

Thanks, Dan 

 

The master number you are referring to is the "Max volumetric speed". This is under Filaments -> Advanced -> Max volumetric speed. Adjusting this number depends on a various factors such as the filament type, printing temperature, nozzle diameter, nozzle type and in some cases even color. For TPU, I would just keep this number reasonably low. Also for TPU, as @foxrun3d pointed out, it must be dried before use. TPU is a water sponge. 

As you your question. I generally print TPU with a 0.6mm non high-flow nozzle and .32mm layer height. With a print speed of 20-40mm/s, if we take the middle 30mm/s, this equates to a volumetric flow rate of 6.5 mm^3/s (30 mm/s * 0.68mm * 0.32mm) [speed * default extrusion width * layer height] For a 0.4m nozzle with 0.2mm layer height this comes out to around 3mm^3/s (30 * 0.45 * 0.2) 

Bottom line though, is you don't need to (and shouldn't) print TPU fast. You also don't (and shouldn't) use a HF nozzle since if it clogs it's a PITA to unclog. Also, there is no benefit to printing TPU fast. Nor do you need detail for TPU so you can keep the layer lines large. 

Start with the Generic Flex profile. For a 0.4mm nozzle this should set the flow rate to 2.5mm^3/s which is good enough.