START HERE - Caffeine (CAS 58-08-2) - READY TO PRINT - ready-to-print release 2026-10-28, package r19
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A model of the caffeine molecule on a display base, printable in one go on a
standard FDM printer (0.4 mm nozzle, PLA). No 3D-printing experience needed.

THE SHORT WAY (3 steps)
  1. Open molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_r19_3MF-project_supports-generated-when-sliced.3mf in PrusaSlicer (answer YES to "load configuration").
  2. Choose your printer, press A (Arrange), click Slice, check the preview (REMOVE_KEEP.png).
  3. Print at 100 % (do not scale). 3MF profile: about 9h 52m 2s, about 85 g PLA (ready G-code: 86-87 g).
  Details: PRINT_INSTRUCTIONS.txt.  Ready G-code for some printers: gcode/.

WHAT IS IN THIS FOLDER
  molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_r19_3MF-project_supports-generated-when-sliced.3mf model + our slicer settings (open this)
  advanced_no-supports/molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_NO-SUPPORTS_add-supports-in-slicer.stl model only (for any slicer)
                                               (the website download has the same file name and SHA-256)
  gcode/                                       ready G-code for named printers + README
  PRINT_INSTRUCTIONS.txt                       step by step, settings, after printing
  PRINT_METHODOLOGY.txt                        why it is designed this way, checks, sources
  REMOVE_KEEP.png                              what to cut off and what to keep
  previews/                                    renders of the finished model + the same views
                                               "as-printed" (with slicer supports) and "after-removing-supports"
  slicer_profile.ini                           all settings (PrusaSlicer format)
  GATES_REPORT.txt                             results of our checks on this exact file
  QC_CHECKLIST.txt                             how to check the finished print
  FEEDBACK_FORM.html                           tell us how it printed
  PROVENANCE.txt                               where the atom positions come from + what we changed
  source/                                      the PubChem 3D source file (SDF)
  LICENSE.txt                                  licence and attribution
  SHA256SUMS.txt                               checksums of every file

THE MODEL
  Base: diameter 100 mm, 20 mm high, raised MolGod logo on top, name and CAS on
  the front, data and QR code (https://molgod.org/molecule/58-08-2/) underneath.
  Molecule: scale 1 A = 10.60 mm; 11 vertical hexagonal pencils with
  45-degree cups carry it - they are part of the model, keep them.
  Size 100 x 100 x 84 mm, 450102 triangles.

WHERE THE GEOMETRY COMES FROM
  Atom positions: PubChem CID 2519, conformer 000009D700000001. COMPUTED by PubChem
  (PubChem3D, using OMEGA) - one calculated conformer, not an experimental
  structure. All 10 hydrogen atoms are shown. Molecule-geometry gate on this file: PASS.
  Details: PROVENANCE.txt.

WHICH FILE TO USE
  WITH SUPPORTS - ready for 3D printing (supports inside the file):
    gcode/*_WITH-SUPPORTS_gcode-<printer>_ready-for-3D-printing.gcode
        load it on the printer named in the file and print.
  3MF PROJECT - any printer, supports are generated when you slice:
    molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_r19_3MF-project_supports-generated-when-sliced.3mf
        open in PrusaSlicer, choose your printer and slice; the project settings create the
        supports. A plain 3D viewer shows the model without supports - that is expected.
  WITHOUT supports - for advanced users:
    advanced_no-supports/molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_NO-SUPPORTS_add-supports-in-slicer.stl
        add tree supports in your own slicer (settings: PRINT_INSTRUCTIONS.txt section 4).
  Why: G-code holds the moves of one printer only; the 0.2 mm gap lets the supports come off
  cleanly - cut them with flush cutters, do not pull; the yellow pencils are part of the model.

VERIFY THE FILE
  SHA-256 of advanced_no-supports/molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_NO-SUPPORTS_add-supports-in-slicer.stl: 61bbb8ec736087dbfad3fb423807465294afff81c257254bf4b07e0728b97f0b
  Windows: certutil -hashfile advanced_no-supports/molgod_caffeine_58-08-2_R3-ready-to-print_g2026-10-28_NO-SUPPORTS_add-supports-in-slicer.stl SHA256  |  macOS: shasum -a 256 ...  |  Linux: sha256sum ...

STATUS
  Checked by geometry tests and slicer simulation of this exact file
  (GATES_REPORT.txt). Not yet confirmed by a physical print of this release.
  Licence: CC BY-NC-SA 4.0 (LICENSE.txt). Model page: https://molgod.org/molecule/58-08-2/

SHOW US YOUR PRINT
  Send photos (with the supports and after removing them), or tell us what failed: pure@molgod.org
  We help with anything about this print until 26 November 2026.
  With your permission we will feature your print on the model page at molgod.org and, if you wish,
  credit you by name in the acknowledgements of our planned scientific publication on printable molecular models.
