ID Card Holster with Lanyard Ring

Overview:

This is a ID card holster that you can use with a lanyard, or belt clip.

Requirements:

• Your ID card must conform to the standard size (typically the same as a credit or debit card) and be no more than 1mm thick.

Bill of Materials:

• PLA Filament colour of your choice

• 1x 24mm ID split ring (OD must be no more than 27mm)

• 2x M2 x 8mm Hex socket cap screws (304 or 316 SS)

• 2x M2 Hex nut (304 or 316 SS)

• 1x M3 x 8mm Hex socket cap screw (304 or 316 SS)

• 1x M3 Hex nut (304 or 316 SS)

Tools Needed:

• Needle nose pliers

• 2.5mm (M3) hex key

• 1.5mm (M2) hex key

Assembly:

Printed Parts, ID Card & RSA Token Preparation:

1. Purchase all items needed (or equivalent alternatives) as per the bill of materials.

2. Print both parts of the clamshell (front and back) as per the project files or using the included GCode.

3. Prepare your ID card by removing it from its original holder.

Clamshell Post Production:

1. Remove all support material from the screw holes and split ring channel. You should be able to do this by hand or by using use the hex keys to poke the support material out of the way from the internal side of the front clamshell half.

Final Assembly:

1. Take the 2x M2 x 8mm and 1x M3 x 8mm hex socket cap screws and insert them into the front face of the front clamshell half. You may need to screw them in through the plastic. They should sit flush inside the front clamshell half.

2. Place the front clamshell with the screws in it face down on your work surface so the internal face is facing upwards.

3. Place the 24mm split ring over the M3 screw protruding from the front clamshell half so that its sits in the circular channel at the top of the ID holster. This is what your lanyard will clip onto.

4. Place your ID card face down in the recess in the internal side of the front clamshell, it should fit snugly and be flush or slightly recessed inside the recess. The front of the ID card should be visible through the opening in the clamshell, but not be able to fall out.

5. Take the back half of the clamshell and place it internal face down onto your worksurface. Place the two M2 hex nuts and one M3 hex nut into their respective recesses. The M3 nut will sit flush with the back surface, the M2 nuts will sit recessed. You may need to push the M2 nuts deeper and align them so they sit flat in the bottom of the recess.

6. Pick the back clamshell half up and place it over the top of the front half and position the locating slots so they accept the raised guides  on the internal face of the front clamshell.

7. The guides should interlock and the two halves come together with no gap between them.

8. Pick the holster up, keeping the two halves together and use the hex keys to tighten each screw. The screws just need to be finger tight so the holster doesn't separate.

9. Take your favorite lanyard and clip it onto the split ring on the top of the holder.

10. Enjoy.

Result:

• Your ID badge will be held securely inside the ID holster.

• Attaching it to your favorite lanyard will allow you to place it over your head and wear it around your neck.

Attribution:

• The lanyard shown in the photos was sourced from a Wellington, New Zealand based Information Security Conference known as Kawaiicon in 2025. They are good people, you should check their website out.

• I've used a Snapper (stored value public transport card) as the ID card in the photos.