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config/examples/MakerGear/M2 Rev H/README.md

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+# Overview
+This configuration is built and tested for the MakerGear M2 Revision H. I will try to note obvious differences in the other revisions to help support them. Some of the original firmwares notes are incorrect but many of the details are available here - https://makergear.zendesk.com/hc/en-us/articles/360022528292
+
+# Z Max Homing on Rev F, G, H
+Revision E moved the Z endstop switch to the bottom/max. For all other revisions set `Z_HOME_DIR` to -1 for Z Min Homing. This is not a common configuration and certain unexpected behaviours may occur. The primary solution has been to move off the endstop by 5mm with `HOMING_BACKOFF_POST_MM`. This mitigates the current Bed Tramming routine moving down by `BED_TRAMMING_Z_HOP` which defaults to 4 and does not respect Z_MAX_POS. 
+
+### Warnings
+If the bed is left all the way up. Take care when doing things like loading filament immediately after powering on the printer. With Z Max homing the printer will not lower the bed because it may be at Z Max but it will raise it after. This raise/lower prior to homing can be eliminated with `NO_MOTION_BEFORE_HOMING` at the cost of being able to jog the motors while not homed. Prior revisions have the opposite and/or less of a problem. They will lower the bed (even if all the way down) and raise after.
+
+## Motor / Endstop / Pulley Changes
+### Endstops
+ - Rev F, G, and H are Normally Closed (Hit State HIGH)
+ - Earlier Revisions are Normally Open (Hit State LOW)
+   
+### Z Motor
+ - Black Motors on Rev F, G, and H require `INVERT_Z_DIR true`.
+ - Black Motors on Rev C.1, D, D.1, E and E.1 should be false.
+ - Silver Motors on older revisions should be true.
+   
+### Extruder Motor
+ - INVERT_E0_DIR false for Rev F, G and H
+ - Previous revisions are currently unclear but likely set to true.
+
+### Steps Per MM Changes
+ - Revision G and H use 16 tooth pulley specifed as 80.1
+ - Prior Revisions use 18 tooth pulley specified as 88.88 or 88.89
+ - Silver Z Motors are T8x8 specified at 400
+ - Black Z Motors are Imperial 1/8" specified at 1007.7 
+
+# Hotends
+Specified operating temperatures by version. Firmware maximums were typically plus overshoot.
+ - v3a - 220ºC
+ - v3b - 250ºC
+ - v4 - 290ºC 
+
+# Setting Distance Between Nozzle and Bed
+Most revisions use M206 to set the nozzle distance from the bed. Z Max homed revisions will be a slighty different experience from Z Min homing. I have set the Z Max to 210 which on my Rev H puts the nozzle a little over 1mm from the bed before dialing this in. My printer currently as an example has M206 Z1.2 set. If I changed Z_MAX_POS to 200 I would have to do M206 Z11.2 instead.
+
+### Basic Guide
+ - Power on the Printer
+ - Connect Pronterface first as it will reset the printer
+ - Home `G28`
+ - Move X and Y to Bed Center `G1 F4000 X100 Y150`
+ - Move Z Up to 0, You can be careful but not going all the way at first.
+   - First Move very close `G1 F1800 Z5`
+   - Slowly move the rest of the way `G1 F100 Z0`
+ - At this point your nozzle probably is not close to the bed at all. Measure or take your first guess at how much closer you need to be.
+   - Enter this first attempt lets say 1mm with `M206 Z1`
+   - Home `G28` and move back to check the adjustment `G1 F4000 X100 Y150 Z0`
+   - Adjust again for example .2 mm closer enter the full amount total `M206 Z1.2`
+   - Rinse and Repeat the last 2 steps until you feel ready to test printing
+ - Saved the setting with `M500`
+
+If the printer's bed is not trammed I would tram it now under Probe & Level. During the first test print double click the screen knob to activate baby stepping. If you find you need further adjustment for example we moved +.05 away from the bed to make it just right you can later adjust your M206 value from 1.2 to 1.25. Don't forget to save.