Setting Print Speed (Need to slow it down)

Bambu Lab Software Bambu Studio
1

All,
Ive been printing for a while now (PLA+ mostly), but switching to PETG because the things Im printing shrink a lot inside the car on a hot day. Ive found that when printing PETG (Sunlu), using the default parameters still are a bit sloppy. Ive been starting the print and then hitting the Silent button on the touchscreen and that will slow it down a bit, but what I want is to know what setting(s) within Studio has the direct correlation to speed. Is it the Volumetric Speed or it really setting the Outer Wall, Inner Wall, Sparse Infill, Internal, etc…

2

Yep, that’s the speed’s

This only affects speed once the value set here is exceeded. It’ll reduce the speed to achieve this volumetric flow.

You may want to search the forum for PETG printing tips. Default settings are not always so helpful. In my case, I did slow down to 25% of recommended speeds and replaced part cooling by aux cooling (X1C). That may however not always be neccessary.

3

So to reduce the speed by 50% I would halve the values of the following:

Initial Layer Speed
Initial Layer
Initial Layer Infill

Other Layer Speeds
Outer Wall
Inner Wall
Sparse Infill
Internal Solid Infill
Top Surface

Overhang Speed

Bridge

Gap Fill

Example if my Outer Wall needs to slow down, and its set to the default PETG speed of 200mm/s, then taking it to 100mm/s should reduce the speed by 50% when printing the outer wall, correct?

4

Yep. That’ll do it.

But look a bit further in the forum. There are many things to take care about when printing PETG as it is not forgiving. You’ll find that you also need to avoid crossing line patterns (i.e. use monotonic or concentric surfaces, gyroid or honeycomb infill) to avoid nozzle build up, that Bambu’s generic PETG settings are better than their specific Bambu PETG settings, overhang issues, etc.
[SOLVED] Bad quality when printing PETG - Bambu Lab X1 Series - Bambu Lab Community Forum is just one of many.

5

I never mess with speeds…a waste of time. Set volumetric flow for all filaments. Petg 7.5, tpu 1.0, pla 15, pa 7.5

6

Setting volumetric flow lower will limit the maximum speed, but if you need certain things, like overhangs to be even slower, it will need to be set there, unless you’re willing to slow the whole print down to that speed.