HeroMe Gen 7-compatible Anycubic Mega-S X-Gantry

The original HeroMe Gen7 X-gantry design did not fit on my Anycubic Mega S.

It seems that the X-gantry rods are spaced and sized differently on some versions of the Mega or Mega S. (On my Mega S, the X-axis rods are 8mm in diameter, and spaced 50m apart. These parts are designed for that hardware)

I considered simply remixing it (and ultimately did) but I also saw an opportunity to keep something similar to the original Anycubic Mega S X-Gantry plate system.

This X-Gantry mounting plate attaches to the Mega-S' original linear bearing brackets using the original bearing bracket screws. I found that by doing this I was able to keep a greater Z-direction clearance of the X-gantry from the bed.

You Will Need:

1 pc of each part in this Printable

• X-Gantry Adapter Plate
• Belt Locking Cover
• Backplate

7 pcs (or 8) M3 threaded inserts (less than ⌀4.7mm OD like other HMG7 inserts)

6 pcs M3x10mm screws

4 pcs M3x6mm screws

1 pc M3x8mm screw

Printing Instructions:

1. Print one (1) each of all 3 parts in original stl orientations. 
   • NOTE: If you have poor bridging performance, you will need supports, or the air duct sections will need cleanup.
   • Recommended settings:
     • 4+ perimeters
     • 6+ bottom/top layers
     • 0.4mm line width
     • 0.2mm layer height
     • 30+% infill
2. Check clearances:
   • The backplate should easily mate flush with the X-Gantry Adapter plate with the 3 guide lines fully inserted.
   • The X-Gantry plate has counterbored holes that should have a counterbore diameter of at least 7.5mm. Ream out if necessary.
3. Hot press the 3x M3 threaded inserts as shown in the X-Gantry Adapter plate. 2x for the belt cover, 1x for the belt locking screw. (The extra one near the top corner of the plate is optional)
4. Hot press the 4x M3 threaded inserts as shown on the backplate.
5. Clean up any excess plastic that may have escaped the pilot holes of the M3 threaded inserts. Clean up the bridged air ducts if necessary, the smoother the better.

Assembly Instructions:

1. Remove old hotend assembly, and save the linear bearings, linear bearing bracket mounting screws, and the original timing belt.
2. Thread the belt around the motor and opposing pulley. Insert one end of the belt and then the other end into the X-Gantry Adapter plate. There should be some overlap of the belt ends, and you may want to use needle-nose pliers to pull tight before inserting.
3. Insert and tighten the M3x8mm belt-locking screw. Be sure it grabs both belt tails tightly, but over-tightening my warp your printed part.
4. Place the belt locking cover over the belts and affix with 2x M3x10mm screws.
5. From the front of the machine, attach the original Mega-S linear bearing brackets to the X-Gantry Adapter Plate using the original screws. (NOTE: alignment of 8x screws here is difficult, don't fully tighten anything until all are inserted and threaded into the bearing brackets.) Make sure the linear bearings are also inserted in the brackets and roughly centered.
6. Attach the backplate to your HMG7 Universal base using 4x M3x8mm screws.
7. Insert the backplate into the X-Gantry Adapter Plate using the 3 alignment lines, and attach the two using 4x M3x10mm screws.
8. Check the travel of the assembly on the X-axis manually. There should be no rubbing belts or screws.

CAUTION: Using the HMG7 hotend means your X-axis endstop will probably not work in its original position. Check that your fully assembled HMG7 hotend + gantry plate contacts the endstop before trying any prints. If not, modify how the endstop switch is mounted or bend its bracket or something until you get reliable switch contact on your new hotend assembly.