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Update README.md 

Mention potential issue with Cura's default jerk & acceleration values
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David Ramiro 2019-02-04 02:00:51 +01:00
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@ -7,16 +7,19 @@ Feel free to discuss issues and work with me further optimizing this firmware!
I am running this version on an i3 Mega Ultrabase V3 (for distinction of the different versions, check [this Thingiverse thread](https://www.thingiverse.com/groups/anycubic-i3-mega/forums/general/topic:27064)).
Basically, this should work on every Ultrabase version that has two Z-axis endstops. The new Mega-S could work too but is not thoroughly tested. E-steps need to be set to 384 (`M92 E384.00` + `M500`), and calibration is recommended as per the instructions below.
Note: This is just a firmware, not magic. A big part of print quality still depends on your slicer settings and mechanical condition of your machine. Since I have reduced the acceleration and jerk settings a bit, depending on your slicer the estimated print time might be around 20% lower. You can compensate that loss of speed by raising the general print speed without losing quality.
Note: This is just a firmware, not magic. A big part of print quality still depends on your slicer settings and mechanical condition of your machine.
## Known issues:
- **Cura users: Please turn off jerk and acceleration control in your print settings (not visible by default, select advanced visibility to unlock them). Cura's high default jerk and acceleration might cause shifted layers if you use TMC2208.**
- Estimated print times from your slicer might be slightly off.
- Special characters on any file or folders name on the SD card will cause the file menu to freeze. Simply replace or remove every special character (Chinese, Arabic, Russian, accents, German & Scandinavian umlauts, ...) from the name. Symbols like dashes or underscores are no problem.
**Important note: On the SD card that comes with the printer there is a folder with Chinese characters in it by default. Please rename or remove it.**
- The firmware is not reflected on the TFT-display. As the display has its own closed source firmware, you will remain to see the original Anycubic menu showing the old version number (1.1.0).
- Cancelling prints via display is buggy sometimes, simply reboot the printer when the menu shows an error. Protip: Switch to OctoPrint.
- A few parts cooling fan models (e.g. some Sunon 5015) might have trouble running slower than 100%. If that's the case, use [this release](https://github.com/davidramiro/Marlin-AI3M/releases/tag/v19.01.22-pwm).
## Why use this?
While the i3 Mega is a great printer for its price and produces fantastic results in stock, there are some issues that are easily addressed: