This is a parametric end cap (rounded/“bullet” bottom) modeled in Fusion 360. You can generate your exact size right on MakerWorld:

Customize Online: Click Customize → set Outer Ø, Inner Ø, Height, Fit (clearance), and Chamfer → Generate to get a fresh STL/3MF.

• Keep inner_d < outer_d − 2×clearance.
• Height should be ≥ outer_d / 2 (room for the domed bottom).
• Default loads as 10 mm OD, 8 mm ID, 0.20 mm clearance per side (0.40 mm total), small mouth chamfer.

Use cases: laptop stands, chair legs, camera rigs, and any tubing that needs a snug, protective cap.

Material tips

• TPU 95A: best grip & vibration damping (my pick for metal tubes).
• PETG: durable with a touch of flex.
• PLA: prints easily; works if you don’t need much flex.

Fit tip: If it’s tight/loose, re-generate with clearance adjusted by ±0.10–0.20 mm.

Printed, tested on a Bambu Lab P1S.

Safety/Disclaimer: 

• Provided “as is.” Not certified. No warranties. Use at your own risk.
• Verify fit/clearance before use. Do not use if it interferes with normal operation, safety features, or emergency shutoff.
• Inspect regularly; stop using if loose, cracked, warped, or damaged.
• 3D-printed plastics can deform with heat, UV, chemicals, or load—avoid high heat and harsh cleaners unless you know the material is suitable.
• If this model holds/uses a sharp edge or blade: handle with care, keep out of reach of children, and use only as intended.
• Keep out of reach of small children; small parts can be a choking hazard. Adult supervision recommended where applicable.
• Not affiliated with or endorsed by any brand mentioned; all trademarks belong to their respective owners.