3 Way 3/8" Doweling Jig

This is a very versatile little dowelling jig. I designed it so that I could complete a custom furniture commission and made every one of the ~100 dowelling holes with this one jig. I have incorporated some updates since I used it based on lessons learned with my first iteration.

You will need the parts listed below to finish out the build.

1" long, 1/2" OD, 3/8"ID Steel Spacer
https://www.lowes.com/pd/Hillman-3-8-in-x-1-2-in-x-1-in-Seamless-Steel-Spacer/3012477

Some 3/8" dowels to use as pins for the self centering feature. You should already have those since you need a dowelling jig!

I think the mounting hardware I sized it to was a 1.25" long 10-24 (or 32 at your preference) bolt and nut combo with a fitting washer on the top side to keep the bolt head out of the slot.

Print instructions

I would recommend using a higher temp filament since the drill bit will eventually pull the bushing out once friction heats everything up.

The included gcode file turned out great using orange Prusament PETG with a nice tight friction fit on the 1/5" OD spacers. I opted to slice the file with ironing enabled. Although it doesn't add to the functionality, it does make it look very nice right off the print bed.