I designed this Safety Razor dispenser / Sharps Disposal box as part of a gridfinity conversion of my medicine chest. It is 2X1X9 Gridfinity Units and is not stackable.

Parts Description:

• Sharps Base - This is the main body of the design which has a 2x1Gridfinity compatible base, a blade storage cavity, and a blade disposal cavity. The base has holes, both in the front of the storage cavity, and between the two cavities. These holes allow a piece of filament to hold the spring in a partially compressed state, so the glue can dry without being pulled apart by the spring. After assembly, the front holes allow visibility to the number of blades in the storage compartment, while the holes between the cavity allow circulation of air into the mostly sealed disposal cavity.
• Sharps Lid - This is the lid of the unit, which holds the blade in the storage cavity against the spring pressure. It also seals the disposal cavity with the exception of the curved input slot. The slot allows the blades to be pushed into the cavity, but prevents them from falling back out, regardless of orientation. This part is available in multi-color and single color variants.
• Blade Spring - This is the leaf spring which presses the stored blades against the lid for them to be dispensed. It is recommended that this part not be printed from PLA since it will deform over time with constant load, and the spring force will be lost.

Print Instructions:

Print the Lid (shown in green) face down on the build plate for best results. Base (shown in orange) should be printed with the two main openings facing up. The Spring (shown in blue) should be printed on its side so all of the openings are facing straight up. A brim may be required for the spring to print successfully and PLA should be avoided for this part, to prevent it from losing springiness over time.

Assembly Instructions:

1. Place the spring into the larger of the two openings in the base.
2. Press the spring down with your finger.
3. Insert a scrap piece of filament through the front viewing holes, over the top of the compressed spring, and then through the holes between the two chambers. (This filament will now be holding the spring in a partially compressed state)
4. Apply a bead of CA glue around all of the top mating surfaces of the base.
5. Place the lid on top.
6. Let dry in this configuration as per the instructions of your glue.
7. Remove the filament and allow the spring to return to its full length, which should be pressing against the lid.

Usage Instructions:

You may now load your safety razors into cavity with the spring and pull them out one by one. Once they are dull, you can push them into the opening into the the other cavity where they will be held safely. The curved shape of the opening will ensure that the blades can be pushed in, but cannot come back out on their own.

Disposal Instructions:

When the disposal cavity is full, dispose of the entire unit to keep yourself and your community's sanitation workers from being harmed by the blades.