Yeah, I've found reseating cables and checking for play in connectors is the most common solution to this -15 issue. One of my thermistors was damaged in my case and I had to desleeve and resolder near the thermistor, wrapping it back up with electrical tape (though shrink wrap would probably be better).

https://github.com/snatella/makertech-cura-linux is available now with a release of Ultimaker Cura 3.6.0 for Linux with the Makertech Cura 3.6.2 resources. Ultimaker Cura on Linux is either AppImage or Docker based (new with 4.X I believe). The Docker setup is more complex, so for now I'm repacking the AppImage. As it stands the Makertech Cura 3.6.2 resources don't work with Cura 4.X so the repacker I've made is sufficient _at this time_.

@Adrián Chacón Ordóñez sorry I had the email notifications sent to another folder. It's available now at https://github.com/snatella/makertech-cura-linux Thanks to @Makertech for clarifying the licensing :-)

Firmware got updates to fix this: https://www.forum.makertech3d.com/forum/announcements-releases/software-firmware-updates

@Makertech I've got a repacker that takes the official Cura AppImage and repackages it with the Makertech resources for the ProForge(s). I've taken them from the Windows 3.6.2 release. Works nicely and gives a Linux AppImage with ProForge goodness. Would you be OK if I included the Makertech custom resources in a github repository with the repacker script? Are the Makertech custom resources under any license I need to note? Happy to accept PRs for any other needed changes too :) Edit: the Makertech resources are just the printer/nozzle/material/etc definitions - none of your logo work or imagery.

@Daryl Smith as in 0 or -15? If the latter the connections near the head of the thermistors are likely busted, where the black shrink wrap is. If it's showing 0... turn on your central heating? :grin:

My heated bed refuses to adhere to the build plate. The heated bed arrived bowed and the tape just isn't enough to get it stuck. Do I need a new heated bed @Makertech ?

I've found that by changing #define SWITCHING_NOZZLE_SERVO_ANGLES { 0, 100 } // Angles for E0, E1 to #define SWITCHING_NOZZLE_SERVO_ANGLES { 6.9, 95 } // Angles for E0, E1 in Configuration.h that the servo ceases actuating once the end has changed, but the head sits firmly with no wiggle. You may find you need different values. This is very tedious due to the turn off, disconnect touchscreen, plug USB, upload, disconnect USB, plug screen back in, turn on, test, turn off... etc My servo is not warm at all now and not making extra noise. I've done quite a few switches and it's working great. Now to print something!

@Rene Janeke The connection to the thermistor head end is dodgy unfortunately (at the black sleeve), they'll need to be replaced or if you're inclined repaired (beware, that's all heat shrink so it's a pain to tear back). @fg beware you may find your thermistor fails at some point soon.

A number of us are having issues with temperature probes when we've got the 2nd head thermistor in play. In Assembly and DSE forum boards. Edit: May be dodgy thermistors it seems.

@Ernie Bausch looks like there's lots of chinese knockoffs floating around for the servo, which might have something to do with the reviews? The MG996R dimensions are 40.7×19.7×42.9mm and the DS3225MG dimensions are 40 x 20 x 40.5 mm. Might be even more awkward to fit it in... I also wonder if there's a firmware bug that on initial setup is causing the servo to continuously activate. After performing the servo setup presses of 1 or 2 would move the head but it'd sound like the motor was continuously trying to move. Setting it back to 3, and turning the printer off/on solved this, and now it moves and stops actuating when it has moved the head. Sometimes when I turn it on I find it continuously activating. Turning it off/on again fixes this. Edit: looks like the continuous actuation is still going on... will see if I can tweak configuration.h to avoid burning it out.

@Rene Janeke have you got the temp probes for the bed (TB) and 2nd head thermistor (TH2) around the right way? Sounds like what I've got going on with my 2nd head thermistor but my bed temp is correct (I've posted in the dual extruder board).

Interesting after powering on my Proforge 2S this morning I noticed my hotend temperatures are doing weird things like @_aaron has. The first temp is changing between 19-25 quite regularly, and second flips between -15 and 230-280 degrees (the hot ends are still not on of course).