PcS - ah, that would explain it: the app uses the same general protocol/connection method as S3D and Pronterface. How do you normally control that printer?

sthone - the command you're looking for there is G92 . At the beginning of your gcode file, after all homing is done, but before the first move to a Z position for the first layer, you can add "G92 Zn" to tell the firmware it's at a new Z position. In your case, say your layer height is 0.2mm, and y...

jimc - glad that worked X) One note on using the Z jog controls to change your first layer - you're going to lose that change during the second layer. When you physically offset the Z position, by turning the Z knob by hand, the machine and firmware don't know about it - the firmware keeps running g...

Yeah, you guys have definitely given me some thoughts on improvements already. I was thinking along the same lines for the settings - a "settings" window, accessible through standard menu, that lists all the default values the app uses. Nice simple button that resets all to default, but will use and...

jimc - it could be the entire stack: small differences in Z endstop position, hotend length, bed thickness, and leveling screw height. If you go into your favorite gcode sender (or even the Advanced tab, Gcode button in the app), and send: "G28" "G1 F3000 X215 [or whatever X value will get the hoten...

Jimc - I just went back and checked my code, the number I quoted earlier was off a bit - it moves to "Z10", which on my machines usually ends up ~20mm from the nozzle; I've also been using exclusively V4 hotends, but did test it works with the V3B without issue. So if your hotend is longer than a V3...

insta - during that testing, did the app actually properly connect to your printer? Did you hear the fans cycle/see connection LEDs flash when it tried to connect? It's using standard gcode for all actions - the movements are literally the same that Pronterface and S3D use (go relative, move whateve...

insta - what exact buttons don't move/don't move correctly? Does the printer really not respond to _any_ of the movement buttons? If so, could you send me a copy of the firmware you customized for it? Also, make sure your setup homes correctly: if you don't change the "Z_HOME_RETRACT_MM" value in co...

sthone - what does the firmware echo back when you connect to the printer now? And what does it echo back if you send "M119", with no endstops activated, vs. pressing the Z Max endstop by hand?

Fair enough X) PM sent - let me know how things go, if there's anything specific needed extra, etc. etc.