X-Acto (Exacto) #11 Knife Blade Cap, "Tuned"

I needed a replacement blade cover for my X-Acto #11 blade hobby knife, but in spite of several 3D print design options available, I could not find one that exactly met my preferences. My 3D print design, based on the Excel hobby knife cap but "tuned" to my preferences, tries to incorporate these features:

1. Designed to not roll on slightly slanted surfaces.
2. Reinforced tension slot edges to reduce breakage by layer line separation.
3. A bit Longer and wider blade slot to support 3rd-party blades that may have slightly different tolerances than X-Acto brand #11 blades
4. Tapering edge curves for easier blade insertion into the cap.
5. Easy printing, no supports or rafts required.
6. Source CAD file support to simplify making future hobby knife/blade cap combinations.

New! (4/25/2024) - I now have several other safety caps for other sizes/brands/models of hobby knives on my new thing page at https://www.thingiverse.com/thing:6595509. You can even create your own specialty cap from pre-defined tables!