Creality Ender-4 Mega Rails Upgrade - linear rails at all axes

myminifactory

It appears you've provided a detailed shopping list and to-do list for modifying a 3D printer, specifically mentioning the addition of optical end stops and a re-configuration of the motor connections. However, I'll outline the main points from your text: ### Shopping List 1. **Pulleys** - 2 x Pulley 20 teeth 2GT with 4mm bore (for X and Y axes) 2. **Optical End Stops** - 1 x Opto-switch for X-axis - 1 x Opto-switch for Y-axis - 2 x Opto-switches for DIY 3. **Fasteners** - Various M3, M4, M5 bolts and nuts in different lengths (e.g., 8mm, 10mm, 14mm, 20mm) - Aluminum corners and T-nuts for assembly 4. **Miscellaneous** - Bolts and Nuts Sets - M3, M4, M5 Hex Head Cap, various sizes - M3 bolts with hex head, socket head, and nuts set of 340pcs (M3-5-6-8-10-12-14-16-18-20) - M4 bolts Hex Socket Set of 120 pcs (M4-6-8-10-12-16-20) ### To-Do List 1. **Design and Assembly** - Design a plate for the Y-end optical stop - Re-design the 5015 duct to recover print area in the Y-dimension 2. **Firmware Adjustments** - Invert X-end switch (since it's now an optical end stop) by defining `X_MIN_ENDSTOP_INVERTING false` - Adjust BLTouch offset: define `X_PROBE_OFFSET_FROM_EXTRUDER` to `-27` and `Y_PROBE_OFFSET_FROM_EXTRUDER` to `0` 3. **Inspiration** - The modifications are inspired by several 3D printer designs available on Thingiverse. ### Additional Notes - Motor re-connection: Due to the change in belt attachment from front to back, motors had to be flipped to face forward again. - Firmware adjustments are necessary for optimal performance with the new optical end stops and BLTouch configuration.