MK3 to MK3.9 size increase
My MK3S+ is in a third party box and doesn't have much more extra space inside.
Is there a size increase associated with the upgrade? I especially think of the X axis (I have about 10mm space between axis and windows) and the extruder in maximum Z position (about 40mm space, so designing a filament feeding system might be complex if it's higher, though not impossible as there is a wide slit to install an external feeding funnel).
Which advantages do the nextruder provide? The main issues I can see today with stock MK3S+ are oozing, TPU jamming if I don't reduce speed, and rear facing overhangs which warp but this is a cooling issue.
Thanks!
RE: MK3 to MK3.9 size increase
i think only the z is 10mm higher
RE: MK3 to MK3.9 size increase
The 10mm gain is mostly from the "shorter" bottom design of the nextruder.
For exterior dimensions. The Nextruder at top Z is 40mm above the frame without mods. Is the X carriage assembly bigger seems to be your main concern. I measure it at 455mm wide. My power supply is remotely mounted. Z is the same.
In my MK4 notes I list advantages of Nextruder and some comparison to the MK3 size.
I haven't done TPU yet, but I find this mod for TPU interesting. It could be a result of tolerance stack up. I am going to add it at my next service interval. See his Youtube video.
Oozing between prints, I find the MK4 does a little more, but during printing no problem.