MK4 how to give more "squish"
Hi Everyone,
Wondering if there is a way to make the MK4 give a little more squish (negative Live Z)? Most of my prints, since I've upgraded from MK3S, seem to lift off the print bed on at least one or or end resulting in a warped print and distorting features. Yes, my print bed(s) are clean. When I feel the bottom of the print regardless of using a smooth or textured sheet they are not as smooth or textured as they were on the MK3S.
- 1st "printer" TIKO 3D
- 2nd PRUSA i3 MK2S with MMU v1
- 3rd PRUSA i3 MK2S
- 4th PRUSA i3 MK3 with MMU v2- 5th PRUSA i3 MK4 (upgraded from MK3) with MMU v3 (upgraded from…
RE: MK4 how to give more "squish"
Stand in front of your printer and as soon as the printer starts moving to print the purge line, press and hold the control knob until the live adjust z menu shows up. Immediately rotate the knob counter clockwise to set the -z value as appropriate. I use -0. 025, but I suspect you will find your own sweet spot.
Until yesterday, I only had to do this with the textured sheet, but now I have to do this for all prints regardless of the sheet I use.
RE: MK4 how to give more "squish"
Lynn,
Thanks. I must have tried that at the wrong time as it didn't bring up the adjustment screen. Thanks. So far I'm at -.04 mm adjustment and still getting a slight lift at one of the corners, but its definately less then before.
- 1st "printer" TIKO 3D
- 2nd PRUSA i3 MK2S with MMU v1
- 3rd PRUSA i3 MK2S
- 4th PRUSA i3 MK3 with MMU v2- 5th PRUSA i3 MK4 (upgraded from MK3) with MMU v3 (upgraded from…
RE: MK4 how to give more "squish"
You can try inserting this Z-axis reduction into the printer profile in PrusaSlicer. Printer Settings tab -> Offset Z.
RE: MK4 how to give more "squish"
You can try inserting this Z-axis reduction into the printer profile in PrusaSlicer. Printer Settings tab -> Offset Z
Not really a great solution if you frequently switch between sheets and filament types and brands, as the ideal offset seems different for different combinations of those. But may be fine if, e.g., you exclusively print PETG on textured.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: MK4 how to give more "squish"
With the MK3, you also had to have several profiles for different sheets because they differed by a few tenths of a millimeter (for example, a textured plate versus a smooth one). I also almost destroyed a smooth sheet on my modified MK2 with a magnetic bed from MK2.5, when I forgot that with a smooth sheet it is necessary to increase the live Z by 0.35 mm and the nozzle quite "successfully" dug into the smooth plate. Luckily it was on the edge and it didn't matter that much. But the point here is that this value is so small (within a few hundredths of a millimeter) that it would certainly be possible to find a universal value suitable for all sheets, given that the surface here is actually measured from the surface and not from the inner metal part detected by the inductive probe. Perhaps for even better adhesion, it would be worthwhile to lightly sand the plate with the rough side of a dish sponge. Even Josef Prusa once recommended this regrinding on MK42 pads with a PEI coating. And I actually applied it on a textured sheet as well and since then I haven't had any problem with the adhesion of PLA on that sheet as well. This oversanding slightly dulls the protruding peaks of the texture and is not visible at all in the final print.