FractMod- Two Nail Marking Tool

Mounting items with two nails no longer has to involve a measuring tape.

This compact marking tool delivers fast, clean, and perfectly spaced drilling points every single time.

Slide the links apart until they extend past both hanging points, turn the ¼ turn cam to lock the links in place.

Align the measuring probe on one side, tighten the locking nut, then repeat for the opposite side.

Position and level the tool on the wall, press it against the surface, and the built-in markers leave two precise drill points at the exact spacing of your frame or décor.

Features

• Dual-point marker for perfect two-nail spacing: no rulers, no measuring, no guessing

• Spring-loaded plunger, locking nuts, and cam lock keep the tool positioned without accidental marks

• Precision contact tips leave clean, repeatable drill marks

• Compact and shop-ready: ideal for frames, décor, shelves, and hardware

• Durability-tested spring identical to the original KMT spring (500+ cycles, zero failures)

• 100% printed design: no screws, pins, or hardware needed

Print Notes

The spring and plunger are unchanged from the original KMT design, no dimensional updates were required.

Parts needing extra adhesion to be printed on the A1 and A1 mini already have a brim added, so no slicer changes are needed.

The only supports in this print are for the top flat of the spring, and they detach cleanly.

Print Recommendations

• Material: PLA or PETG

• Layers: Use adaptive layer height to maintain sharp spring geometry, threads, and contact tips

• Infill: 10–15% Gyroid

• Orientation: Print all objects in the orientation set in the profile

• Supports: Tree supports touching build plate only (for spring top flat)

Print profiles have been optimized to provide clean, accurate, repeatable results on most machines.

Assembly

Assembly instructions are included in the model files.

Looking for the Single-Keyhole Version?

This tool is built on the same proven internal mechanism as the Keyhole Marking Tool (KMT).

If you haven’t tried the KMT yet, it pairs perfectly with this one and remains one of the most reliable ways to mark keyholes with zero guesswork or measuring.

Thank you for checking out this design! Your input directly shapes future versions and upcoming tools, so please:

🔧 Post a make if you print it

📝 Share feedback about print quality and performance

💡 Suggest features or next-step tools you’d like to see

Your ideas and feedback help push functional 3D printing forward.