Mk3.5 LCD cover printed on MK3S+ without MMU

This is the same as @MalikDrako_2006414 files except the m3f file has been tweaked to print on a MK3S+. So if you are desperate to print on the MK3S+ use this otherwise use the original after upgrading to the MK3.5.

I had a lot of struggles getting this to print well with a 0.25mm nozzle, but I'm new to 3d printing, which might explain it. The main issue was getting the various overhangs to not turn into a mess. The eventual solution was to print at high temp and slowly. 

I'm using Prusament PETG on a satin sheet. No glue stick except in the lower left purge area. My enclosure is open during printing. Humidity was around 40% in a cold garage and spools were out in the open.

Notice in the pictures I still had problems on the corners with too much melting. Another issue was not being able to get the bed precisely level, even with micro adjustments. You can see the lower right is too high and the filament is too thin. I didn't have the time to tweak it any further. But I would recommend only printing a layer or two and then checking the results after each adjustment. With the 0.25 nozzle I ended up going lower against the bed than would be expected to get nice results on the black, flat part of the face. And don't forget to turn off inside perimeters for the first layer to get the lettering to look nice.

Another headache was printing the word “Reset”. Letters would not print or lift off if the Z axis was too high off the sheet. That is why I modified the order to print white first, so I can immediately know if the Reset would print. Having a properly clean sheet helps a lot with “Reset” printing. I also notice variable print quality depending on the color. Not sure what caused that.

Only 4 colors are used since I don't have red. The gray I have is too dark, but it works.

One support was added for the USB opening as it seemed to give better results.

I'm using custom gcode I found on the forum. Search for ‘ “Manual” multicolor ’ and find @mike_gka on page 6. I had to tweak it slightly, but it is nice in that it tells you on the screen what print color is coming next. Once you get used to how the print head moves around for a color change it works pretty well. I definitely recommend using the prime/purge tower.

The custom gcode immediately starts printing so have the right color in the printer before starting the print - it doesn't have that first ‘change to the same color’ issue like the simple tool change gcode.

I use 10 or so loops of all the (non-black) colors to avoid having to swap heavy spools every minute at the start.

Color order (search for “next color is” in the gcode)…

• White
• Orange
• Gray
• Black
• White
• Orange
• Gray
• White
• Orange
• Black
• White
• Black

Changes to the profile (I may have gone overboard on some of these):

• Layers And Perimeters: 
  • First layer height 0.12 (to get finer detail on “Reset”)
  • Only one perimeter on first layer: checked (improves appearance of words)
• Speed:
  • External perimeters: 10 (to avoid overhang problems)
  • Dynamic overhang speeds: 75%=10, 50=7, 25=5 0=5 (to line up with external perimeters speed)
• Filament:
  • Nozzle temp higher by 10C (to equal what Prusament PETG preset uses)
• Cooling:
  • Fan speed min = 80, max = 100 (to help with overhangs)
  • Disable fan for the first 2 layers (to get good bonding)
  • Dynamic fan speeds: set all to 100% (to force min/max to max values)
• Printer:
  • Extruders: 4
  • Single Extruder Multi Material: checked
  • Custom Gcode: Adapted code from someone’s suggestion on Prusa Forum to make the tool change significantly better
• Extruder (each one):
  • Set color appropriately (in this order, white, orange, gray, black)
  • Travel lift increased to 0.6 for safety
  • Use ramping lift with 0.6 and 45 degrrees (hoping to prevent stringing and blobbing issues)
  • Retraction length: 0
• Single Extruder MM setup (based on others’ suggestions on the Prusa forum):
  • Cooling tube position: 10
  • Cooling tube length: 0
  • Filament parking position: 0
  • Extra loading distance: 0
  • Purging volume: 30