Scope shooting and filming camera attachment

This scope attachment allows you to shoot and record scope view simultaneously.
It uses a semi-transparent mirror to send part of the light to the camera and the rest to the shooter's eye.

The attachment is a modular design consisting of the main body housing the mirror, scope mounting adapter, and phone holder.
You will get the best results using 50% mirror, but you can experiment with window tinting foils (try to find something in the range of 40-75% reflection.)

There is no standard mirror size, so the device's small footprint determines it.
You need to cut the mirror to 47mm x 32mm. The main body accounts for the standard 4mm mirror thickness.
If your mirror is thinner, you need to use a spacer behind the mirror - the mirror needs to be aligned on the hole edge nearest the scope (one is provided for a 1.1mm mirror)

The Main body has a 28mm collar for attaching phone or camera mounts.
This project provides a universal phone holder, but custom-designed holders would perform better.

Bill Of Materials:

Main body:

Semi-transparent mirror 47x32mm (max thickness 4mm)
4pcs M3 threaded insert
4pcs M3x5mm hex bolt
0-4pcs M3 washer

Scope adapter (for one adapter):

1pcs M3x15mm hex bolt
1pcs M3 nut

Universal phone holder:

5pcs M3 threaded insert
5pcs M3x10mm hex bolt
4pcs M3 washer (preferably big)

Printing:

PLA is not recommended if you will use attachment in full sun because it can deform from temperature.

Print one main body, one plug, one phone body, four phone clamps, and adapters for desired scopes.

Printing the main body and scope attachment with support will improve the quality.
The body can be printed without support.
Scope adapters have an overhang that could be printed without support but will be messy.
Please see included picture for recommended print orientation and support.
All holes are thigh fit for M3. You may size them with a 3mm drill.

body.stl - main body housing the mirror
spacer_2-6.stl - spacer for using 1.13mm thick mirror
plug.stl - plug for capping mirror slot after installation

phone_body.stl - universal phone holder main part
phone_clamp.stl (print 4 times) - clamps for the phone holder

Scope adapters with scopes that they fit.
If your scope is not on the list, choose the closest bigger adapter to the diameter of the eyepiece.
42.0mm - Vortex Viper PST I 4-16X50
42.4mm - Vortex Strike Eagle 1-6x24
42.8mm - Bushnell 1-4x24 AR Optics
43.2mm
43.7mm - Vortex Diamondback Tactical 3-9x40
43.8mm - Bushnell Elite Tactical 3.5-21x50 DMR II
44.2mm - Vortex Diamondback Tactical 6-25x50
44.6mm
45.0mm - Delta Optical Stryker HD 4,5-30x56 FFP
45.4mm
45.8mm
46.2mm - Vortex Viper PST II 5-25x50
46.8mm - Delta Optical Javelin 4.5-30x56
47.5mm
48.0mm

Assembly instruction:

Push four M3 inserts into the main body with a soldering iron. Make sure the surface is flat.
Put the mirror in the main body aligning it closer to the scope. Use a spacer or glue if your mirror is thinner than 4mm.
Plug the hole with a printed plug and cut/sand flat.
Insert nut and M3x15mm bolt to scope adapter.
Attach the adapter to the main body with 4 M3x5mm bolts.
You can put it in any orientation, but it will collide with provided phone holder if the scope clamp is on the collar side.
If the picture on the phone/camera has a dark crescent on one side, you can use washers between the main body and the scope adapter to center the image.

Push 5 M3 inserts with a soldering iron for the phone holder and use M3x10mm bolts with washers to attach the clamps, like in the pictures.
One M3x10mm bolt is used to secure the holder on the main body collar.