Flsun QQ-S pro Linear Rail Mod

Mod to add 2040 (or 2020) Aluminum Extrusions to allow for Linear Rails with original print area of the Flsun QQ-S Pro.
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updated February 5, 2023

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Mod to add 2040 (or 2020) Aluminum Extrusions to allow for Linear Rails with original print area of the Flsun QQ-S Pro. 

I didn't like how the other mods for linear rails on the QQ-S (pro) significantly reduced the print area, so I made my own parts to both give me the original print area, and to add much more stiffness to the whole frame. and i made it to where it will not get in the way, or the motor mounting holes on the newer models.

in turn it made it to where you can have any carriage system you want/need to have whatever effector you want. totally made that a feature on purpose… Hehe…

i added endstop switch screw holes for Omron D2F-5 or equivalent endstops to be screwed in with M2 self-tapping screws. added another set of screw holes for stock endstop switches or equivalent.

you will need:

  • 3x 700mm 2040 Aluminum Extrusion 
    • you can use 2020 if you already have that on hand. will be less stiff but will work.
  • 3x 600mm Linear Rails
    • use whatever will work with your carriage system of choice. 
    • if using a different length of Extrusion, you can't have rails longer than 100mm less than your Extrusion length.
  • 6x of the printed parts
    • 3 for the top, and 3 for the bottom
  • 24x M5 16mm Cap Head bolts
    • if you don't have the stock bolts and nuts on hand
  • 24x M5 Nuts
    • Nylon Lock Nuts if you can, but stock and regular nuts will work just fine.
  • (Optional) 6-18x M5 10mm Cap Head bolts and M5 T-Nuts
    • these are for securing the parts to the Aluminum Extrusion to prevent it from moving or shifting and possibly help keep everything aligned properly.
  • 6x M2 Self-Tapping screws.
    • For the endstops I used Omron D2F-5 equivalents, but stock can work too. there are two sets of mounting holes for whatever you pick.

Print the parts in ABS or ASA, if possible, these will be really close to the heated bed and can experience up too 110° C. I would print them as stiff as possible. i printed min. with 4 walls and 45% infill, but honestly that's probably not really needed. the parts should be a tight fit, if your Extrusions aren't round on the corners, I'd recommend using a chisel (or anything really) and cleaning up the inside corners before assembly.

Please share your build when you're done!!! I'd love to see them!! and if you have any problems let me know!!

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