[CITEST] Matchstick diffusers

[MapleLeafMakers]

• The mod, firmware configuration or slicer profile is in the correct category
  folder. Printable mods go to printer_mods/, firmware configurations
  go to firmware_configurations/, slicer profiles go to slicer_profiles/.
  Create a subfolder with your name, and place the mods in a subfolder with
  a descriptive name within that folder, e.g.: /printer_mods/FHeilmann/flux_capacitor
• Folder and file naming:
  • Folders and filenames shouldn't contain spaces. Only letters a-zA-Z, numbers 0-9, underscores _, hyphens - and periods .
  • Primary color: part_xyz.stl
  • Accent color: [a]_part_xyz.stl
  • Opaque color (Blocks light): [o]_part_xyz.stl
  • Clear/transparent color (Allows light): [c]_part_xyz.stl
  • Quantity, if more than one is needed: part_xyz_x4.stl
• For each mod, add a small README.md file to its folder with a short description
  of what the mod accomplishes. This readme can be used to add pictures, give assembly
  instructions or specify a bill of materials if the mod requires additional hardware.
• The PR modifies the top-level README.md of the category folder adding the
  contribution to the table. Read the top part of the file for instructions on how
  to do this. Please preserve the alphabetical ordering while adding new rows. Make sure
  to fill out the compatibility matrix to indicate which versions of the Voron printer
  the submission is compatible with.
• The mod/configuration/profile has been tested by the person submitting the mod
  and/or other Voron users. Make sure to add information about how the mod was tested below.
• The mod is not merely a slight modification of an official Voron part, configuration
  or profile (i.e. an official Voron part with a few mm added or removed or a slicer profile
  which only modifies a few values). (When in doubt, contact one of the admins in the
  Voron discord before submitting the PR)
• Submitted STLs are printable without support. (If the mod does not meet this criterion
  join the Voron discord and ask the other users for advice on how to modify the mod such
  that it does not require supports)
• Submitted STL files are not corrupt. (This can be tested by opening the STL in PrusaSlicer
  and checking if mesh errors are reported.)
• Submitted STL files are oriented and scaled properly for printing.
• Submission includes a CAD file in the form of a .STEP or .SCAD file
• Submitted firmware configs or slicer profiles contain no sensitive data (e.g. API keys).

Problems

• Space in the filename for the CAD
• Space in the STL Files folder name
• main_body_rainbow_A.stl is not a valid STL file

Which mods/configurations/profiles are added by this PR?

How was it tested?

Any background context you want to provide?

Screenshots (if appropriate)

Further notes

[github-actions]

Hi, thank you for submitting your PR.
Please find below the results of the automated PR checker:

Task	Result	Summary Link	Logs
check_stl_corruption	❌ Exception	Summary	Logs
check_stl_rotation	❌ Exception	Summary	Logs
check_metadata	✅ Success	Summary	Logs
check_whitespace	✅ Success	Summary	Logs
preview_readme	✅ Success	Summary	Logs

Some checks have failed or produced warnings for your PR. Please refer to the individual step summaries to find out what the errors were and how to fix them!

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