DE-BURR / CHAMFER TOOL - DREMEL - ATTACHMENT

Dremel attachment designed for de-burr and general cleanup of parts by adding small chamfer to rough/sharp edges.

Bottom slot engages more into material hence creating larger chamfer.

As a good practice you might want to run it through a top slot first.

You will need either 3mm or 1/8" endmill (Both work just fine with the stock collet).

I have used 3x3x12x50mm (Shaft diameter x Flute diameter x Flute length x Overall length).

Couple tips:

You want a good quality, polished single flute endmill and run it at fairly high rpm to get some torque out of your Dremel.

(Power setting 6 or higher if needed depending on your endmill or material you`re trying to work on). 

Just remember faster does not always mean better… you want to find a sweet spot between not burning/melting material and getting clean cuts.

Attachment can be used as spanner to tighten or losen Dremel`s collet (similar to what their “EZ TWIST” does.

I treat this tool as consumables and simply print another one as it wears out.

You can save old attachments for cutting larger chamfers in softer materials so don`t bin them all.

My personal preference is to use PLA-CF to print this tool. CF adds that extra rigidity and at 10g per print is not a big deal.

However, basic PLA works just fine too.

I have included PETG and ASA profiles in case you want to take your work outside.

ASA profile includes 8mm brim to help with bed adhesion, some post-print clean up might be required.

Feel free to disable brim if you know your printer.

For any other material not included in my profiles, simply used Bambulab`s default settings.

It has been modelled with 3D printing in mind without any tricky geometries or need for supports.

2026 UPDATE: As requested, I am adding a 4486 Keyless Chuck version. In my humble opinion, stock collet route is still superior but you asked for it, so here it is. I had to modify the design to accomodate for larger deflections. Keep in mind… even though it`s called a “keyless chuck” in this application I recommend to torque it with the spanner. These endmills bite hard on the material and expose collet/chuck to quite high axial loads. Finger tight might not be enough :P  

Enjoy!

@mp5works