Any S3D users have an original Prusa i3 MK2?

[wirlybird]

I assume so! Just wondering about your experiences and what you have found for settings issues. Are you using the installed profile or the one from Prusa?

[JohnOCFII]

Greetings,

I've seen your posts in the Prusa forums.

I'm using the Prusa RC4 profile. I've made some tweaks over time. I'm still trying to improve it. Now that S3D has a profile, I think I will try that.

My current challenge is getting the outside perimeter walls on a 20mm cube to be as smooth as they are with the default Prusa Slic3r profile.

John

[wirlybird]

I agree. Outside walls can leave a little to be desired.

[greybeard]

I have two Prusa i3 machines using MK5 (built from Hictop kits). Tweaked to perfection (much better than my DaVinci 1A)

The main tweak that changed the quality was not to S3D but, to the Marlin firmware. Specifically, reducing the Acceleration Jerk from default of 20, down to 2.

That magnitude of 10 difference resulted in best print quality, no more shaking machine to death and quieter.

You can make the change in two ways and can do both:
# 1) The simple way for non-programmers: Use your LCD/machine interface to adjust the Acceleration Jerk.
# 2) Use Arduino IDE and edit config.h for the Acceleration Jerk. You can google it...

The main difference between the two approaches is: #1 is not permanently saved to printer's eprom (in fact, you'd also need to mod the firmware to enable saving to eprom). #2 is permanent though #1 will override firmware setting so do that too.

Regarding S3D, attached is my fff for eSun PLA pro (black). Be sure to address machine differrences, including my gcode scripts if they get included in the fff.
Also attached are images of some parts...

[JohnOCFII]

The main tweak that changed the quality was not to S3D but, to the Marlin firmware. Specifically, reducing the Acceleration Jerk from default of 20, down to 2.

That magnitude of 10 difference resulted in best print quality, no more shaking machine to death and quieter.

Thanks for posting your FFF.

Looking through both the configuration.h and configuration_adv.h files for the MK2 Marlin firmware, the only relevant results for either "Acceleration" or "Jerk" is as below. Is this was you were referring to? If so, it appears the current defaults for X and Y are 10, but I'm sure lowering further could help.

I've been printing 20x20x10mm cubes (or boxes) over the last couple of days, trying to improve surface quality. For an example of where I was starting the day before yesterday, here are a couple of 3DBenchy photos. My tests are better, but I still have some tweaking to do, so any advice is appreciated. I've attached the FFF I used to create the 3D Benchy print.

John

Code: Select all

// The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
#define DEFAULT_XJERK                10.0    // (mm/sec)
#define DEFAULT_YJERK                10.0    // (mm/sec)
#define DEFAULT_ZJERK                 0.2    // (mm/sec)
#define DEFAULT_EJERK                 2.5    // (mm/sec)

[RubenRybnik]

Also have the MK2, I'll be watching this thread for tips since I've tried the RC4 version of the mk2 fff profile and even trying to tweak it it doesn't come close to slic3r as far as quality goes. Hopefully we can come up with some better defaults together.

[wirlybird]

Here is Bnechy on My MK2 in PLA.

[JohnOCFII]

Here is Bnechy on My MK2 in PLA.

20161113_072247.jpg

20161113_072234.jpg

I think your 3D Benchy looks really good!

I've now printed 15 20x20x10 boxes. I'm just about done (or at least satisfied for now).

[JohnOCFII]

I've now printed 15 20x20x10 boxes. I'm just about done (or at least satisfied for now).

I stopped after 17 boxes. I reprinted my 3D Benchy. I'm satisfied for now. Thanks to GreyBeard for the pointer to acceleration values. I realized these are set in the starting script provided with the RC4 FFF from Prusa Research. I modified mine to match the settings Prusa uses in the Slic3r configuration:

Code: Select all

{REPLACE "; outer perimeter\n" "; outer perimeter\nM204 S600\n"}
{REPLACE "; inner perimeter\n" "; inner perimeter\nM204 S800\n"}
{REPLACE "; solid layer\n" "; solid layer\nM204 S1000\n"}
{REPLACE "; infill\n" "; infill\nM204 S2000\n"}

I've also attached my FFF. Here is my improved 3D Benchy. Surfaces are much smoother with the Raptor PLA.

3D Benchy, after: left side, before: right side