Mount designed for adding a 8mm LED strip to the P1S, it slots onto the metal frame around the top right above the X-Y rail. No need for adding a riser or attritional hardware. Comes in 3 sizes, 10mm, 25mm, 40mm and with or without a hook for cable routing. I've only used this on my P1S, if you try it on an X1C and run into a problem, show me a photo and I might be able to modify the model. 

LED Strip used: https://www.amazon.com/gp/product/B0CDKVYPFN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 

How to use this:

• Print out the combination of sizes you want. 
  • TIP: Use the hook ones for where you need to route the LED's power cable
    TIP: Print at least 1 small (no hook) for the front left corner, there isnt much space there but it should fit
• Run the LED strip into the mounting channel
• Plug in the cables
• Press the mounts onto the frame
• Get lit

Recommended combination:

• 3 x Large
• 3 x Large Hook
• 2 x Medium
• 1 x Small

Printing:

• Use a brim since they have a narrow footprint
• PETG or PLA