Archery arrow cutting saw using a Dremel 395

Use a straight piece of wood 90 to 100mm or deeper, 1100mm wide is enough to cut 35” arrows. I used 12mm thick wood, but a bit thicker can be better so you don’t have to use short screws.

Based around a Dremel 395. It should be fairly easy to adjust the models to suit another tool.
Use a cable tie or Velcro tie to hold the Dremel tool in place.

My Dremel tool shaft centre was about 23mm high off the deck.

See the Jig in action https://youtu.be/mO0Yu7kcVwE

If you have a Dremel 395, print the following parts
Dremel bracket A
Dremel bracket B
Dremel bracket C
x2 Jig mid
Jig rear

The following files are in case you want to edit / make adjustments.
Dremel bracket - all parts for editing
Jig mid- Editing model
Jig rear 01 - Editing model

How to make height adjustments to the model to fit a different Dremel tool - Using Microsoft 3D Builder (free software)
Z height - Adjust the Yellow block Z height to the centre of your dremel shaft Z, minus half or your arrow outer diameter.
EG If the centre of your Dremel tool is about 24mm high off the deck, your arrows are 6mm outer diameter. 24 – 3 = 21mm. Make the yellow block Z 21mm high.
Do this for the Rear and Mid jigs.

When your adjustments are done, Save. 
To cut the holes in the model for the screws. Select an orange piece, Edit, Subtract.
Merge all pieces into one model (makes slicing easier) - Select all pieces, Edit, Merge (a few times).
Save as a new file.

Print settings
About 15% infill.
Set perimeters (wall thickness) to 5, this will result in thicker walls around the screw holes.
Enable ironing (Mid and Rear jig) to make the top surfaces smoother, the arrows will slide / spin easier.

Assembly
Mark a line along the wood about 40mm from the top edge, this will be your Dremel shaft centre line. Fit the Dremel brackets on this line.
Note the rotation direction of the Dremel shaft, you want it rotating cutting downwards on the shaft. Align mid blocks so the arrow can be cut on left or right of the Dremel disc, depending on the rotation. EG Dremel rotates anti-clockwise looking at the disc face on, the arrow cuts from the left.

Health and safety

Inhaling any type of dust is bad. Some types of carbon are carcinogenic.

Use the saw outside, put a sheet of newspaper underneath to collect the dust.

Don't inhale the dust. Wash your hands after.

Wear eye protection.