Pre-Defined Profile and MVS  

RE: Pre-Defined Profile and MVS

Yeah, that is probably my fault. I just threw together the two filament profiles that come with the Lulzbot presets just to get something to work. I put basically zero effort into calibrating those filaments. A local library here in Wilmington, DE has a Lulzbot Taz6 and a Lulzbot Mini, both with aerostruders. I'm good friends with the person who runs the technology space there and I wanted to provide for her profiles for PrusaSlicer because I'm more familiar with PrusaSlicer than the Lulzbot edition of Cura (Cura v3.something). But, I only see those printers for a couple hours a week.

Those presets are just enough to get a print done, I would advise taking them as a starting point and calibrate them as much as you feel necessary.

RE: Pre-Defined Profile and MVS

I've got notes on the process here. They're written for a Prusa Mk3 but you should be able to adapt them for other printer.

The setting of 11.5mm^3/s is a good value for an E3D BY hotend with a 0.4mm nozzle mounted and printing PLA. If you use a larger nozzle, less back pressure allows a much higher rate. Other filaments may also flow more easily. You really need to test to identify the best setting. It's week worth doing, IME.

RE: Pre-Defined Profile and MVS

I should really work with my friend so she can calibrate those filaments properly (well, properly IMHO) since I'm not there often. Unfortunately, while I could probably work with her over video chat on the process, both of those printers are currently pushing out COVID PPE. (She actually had to get special permission from higher up in the Library system to allow her to go into work for this task. From what I've heard from her it wasn't really a hard sell. She has good management above her.)

RE: Pre-Defined Profile and MVS

I appreciate the replies. That makes sense. It would be hard to calibrate something like that when you have limited access to it. Plus, it's great they are using them to make PPE.  With the default profile and me not making many changes to it, certain prints would really turn out pretty well. Other prints with certain features I would start to have problems. This is with both my Lulzbot Mini and Taz 6. The Mini also doesn't have an aero. It has the older hexagon hot end with a 0.5mm nozzle. The Taz has an E3d Titan Aero with a 0.5mm nozzle. The Prusa Mini is actually my first printer outside of Lulzbot. I was mostly looking through all of the settings in Prusa Slicer and trying to learn what everything is and does. That's when I came across MVS and I honestly hadn't heard of it. Coming from S3D, all of the configurability and functionality is awesome but also a little daunting at first. For someone that doesn't have a ton of experience with in-depth settings like me. The user guide online has been really helpful though also. If you ever need me to test anything on the Lulzbots just let me know. 

I am going to read through the calibration process that bobstro linked me to and take the time to get MVS set correctly. Thanks for the link and the site. It looks like there's a ton of good info on there. 

Thanks again for the help

RE: Pre-Defined Profile and MVS

Posted by: @sembazuru

I should really work with my friend so she can calibrate those filaments properly (well, properly IMHO) since I'm not there often. Unfortunately, while I could probably work with her over video chat on the process, both of those printers are currently pushing out COVID PPE. (She actually had to get special permission from higher up in the Library system to allow her to go into work for this task. From what I've heard from her it wasn't really a hard sell. She has good management above her.)

If she's printing PPE, I wouldn't worry about it. Most of those prints are focused on speed, not finish.

RE: Pre-Defined Profile and MVS

Posted by: @bobstro

Posted by: @sembazuru

I should really work with my friend so she can calibrate those filaments properly (well, properly IMHO) since I'm not there often. Unfortunately, while I could probably work with her over video chat on the process, both of those printers are currently pushing out COVID PPE. (She actually had to get special permission from higher up in the Library system to allow her to go into work for this task. From what I've heard from her it wasn't really a hard sell. She has good management above her.)

If she's printing PPE, I wouldn't worry about it. Most of those prints are focused on speed, not finish.

Yeah, I didn't think it would be valuable to interrupt the PPE printing just for trying to get the "best" performance from the PLA filaments. She set up her own PETG profile, and it seems to be working well enough for the PPE.

RE: Pre-Defined Profile and MVS

Posted by: @sembazuru

Yeah, I didn't think it would be valuable to interrupt the PPE printing just for trying to get the "best" performance from the PLA filaments. She set up her own PETG profile, and it seems to be working well enough for the PPE.

If she's going to be printing a lot of PETG, do try bumping the MVS setting up and print at the upper end of the temperature range. Much to my surprise, PETG moves through the hotend much more fluidly than PLA. In exchanging messages with someone from Prusa, it seems the low default MVS setting for PETG is for infill quality, and most PPE prints don't have much infill. This is particularly important if using larger nozzles.

RE: Pre-Defined Profile and MVS

Posted by: @ktmderf

I appreciate the replies. That makes sense. It would be hard to calibrate something like that when you have limited access to it. Plus, it's great they are using them to make PPE.  With the default profile and me not making many changes to it, certain prints would really turn out pretty well. Other prints with certain features I would start to have problems. This is with both my Lulzbot Mini and Taz 6. The Mini also doesn't have an aero. It has the older hexagon hot end with a 0.5mm nozzle. The Taz has an E3d Titan Aero with a 0.5mm nozzle. The Prusa Mini is actually my first printer outside of Lulzbot. I was mostly looking through all of the settings in Prusa Slicer and trying to learn what everything is and does. That's when I came across MVS and I honestly hadn't heard of it. Coming from S3D, all of the configurability and functionality is awesome but also a little daunting at first. For someone that doesn't have a ton of experience with in-depth settings like me. The user guide online has been really helpful though also. If you ever need me to test anything on the Lulzbots just let me know. 

I am going to read through the calibration process that bobstro linked me to and take the time to get MVS set correctly. Thanks for the link and the site. It looks like there's a ton of good info on there. 

 

Thanks again for the help

I basically use @bobstro's method for finding the MVS for filaments when I'm tuning them in. When I'm tuning in a new filament I do: extrusion multiplier, temperature tower (choose a single temperature), linear advance, then MVS.  I usually only do this for brand/type, not brand/type/color. (I haven't (yet) been burned by a different color of a tuned filament type performing significantly different than other colors...) I then print a sample swatch for each brand/type/color. It can take the better part of a day to do a full filament tuning (mostly because of the print time of that temperature tower). I do hold onto the temperature tower and label the brand/type for later reference if I want a specific effect.