Peptide Pen & Needle Holder — 3-Pen Version

This is a remix of Peptide Pen Needle Holder by @Carlos_84806. All credit for the original design — and especially the clever needle-tip retention slots — goes to them.

What I changed: 

• Holds 3 pens instead of 2.

• Larger pen bores (Ø20.6 mm) so fatter auto-injector pens drop all the way in; fits ConviPen, GensuPen2, and Incepta pens. (The original's bores were too narrow for these.)

• Wider front clip-slits (10.6 mm) so the pen's clip/window clears as it seats.

• Body 1 mm deeper (25 mm) to keep a safe wall thickness around the bigger bores.

Now fully parametric. It's rebuilt as an OpenSCAD model, so if your pens differ you can change a single number (pen diameter, pen count, pitch, slit width) and regenerate. The .scad source is included.

Print settings (what I used):

• Printer: Bambu Lab X1 Carbon, 0.4 mm nozzle

• Orientation: upright as-oriented

• no supports needed - ~0.2 mm layer height, 3 walls, 15% infill is plenty

• Material: Bambu Matte PLA

Fit notes / how to adapt:

• If your pen is a different size, measure its widest body diameter and set pen_d (bore = pen_d + 0.5 mm clearance).

• If the clip won't slide the front slit, set slit_w to your clip's width.

• If your needle tips differ, re-measure and replace the KEYHOLE_PTS profile in the .scad (keep lip width < tip flange < chamber width so it still retains).

Files:

• pen-holder.stl — ready to slice (3 pens, Ø20.6 mm bores)

• pen-holder.scad — parametric source (edit + regenerate for other pens)