1/3rd Mini ACA Type 1 Allertor

After much time, I'm proud to release my Mini 1/3rd Scale Allertor. This project is something I've been working on since the beginning of 2025, however I've been wanting to make one since 2023 when I first got my 3D printer. And I'm happy to now finally share the official release files for the siren!

(NOTICE):
This page is subject to change, be sure to check back for updates!

UPDATE - May 4th, 2026
Now featuring the VERY late directional 9/12 port assembly, which was factually featured on the Type 1 Allertor before the early Type 2 started production!

UPDATE - May 17th, 2026
So uh, I added the small underside gear for the rotator because somehow I completely overlooked that..

UPDATE - June 26th, 2026
Major update!!! Now I've released the bidirectional 9/12 and 10/12 assemblies! BEWARE I have not test printed either of these so if something doesn't work right let me know!

UPDATE - July 16th, 2026
Fixed the 9/12 bidirectional rotor weight cutouts to proper depth, both bidirectional stators are now 0.6mm gap to account for printer tolerancing and fitment errors, sanding may be required. Thanks to Josh for the initial testing of the 10/12 assembly.

UPDATE - July 17th, 2026
With more people wanting to print my Allertor, I am happy to now release the split intake and bowl files!

UPDATE - July 20th, 2026
Nothing major. Just fixed the Centari Spec bidrectional rotors to have the 8.1mm shaft since I forgot to adjust it in fusion. This doesn't mean you have to reprint the rotor if you already printed it. The coupler does all the major work anyway and it doesn't really matter because the shaft doesn't stick all the way through the rotor anyway

UPDATE - July 17th, 2026
Working on more fixes and stuff, I will no longer add change logs unless its a major update

Hardware/Parts List:

M3x10s
M3 Inserts
M3 Nuts
M3 Washers are optional

4x M4x8s (low profile head required; e.g. Button Head)
4x M4 Nuts

13x M2x8s
3x M2 Nuts

1x 8mm to 8mm Shaft Coupling
1x 6006 Bearing
1x 6002 Bearing
4x 606 Bearings (Rubber Shielded, Metal Shielded or Unshielded will all work)
1x 6mm Bore Gearset 60:1 Ratio
1x 6mm x 200mm Shaft (Reducer to Underside
1x 6mm x 60mm Shaft (Motor to Reducer)
18x 10g Slotted Weights
1x C8 Socket (Its a specific style so I recommend looking at the one I linked, if it has plastic nubs on the bottom, just clip those off and if needed, file or sand it down flat if its rough and causes interference) |
1x 22mm Bore Slip Ring Core

(OPTIONAL):
1x 6mm to 6mm Coupler After Reducer (Requires cutting the 200mm shaft!

Here's some links to help you find what you will need
Shaft Coupler: https://a.co/d/0anfRpOi
6006 Bearing: https://a.co/d/0hAWFY3u
6002 Bearing: https://a.co/d/0jcSnu4Z
606 Bearings: https://a.co/d/0c6VVLCr
60:1 Gearset: https://a.co/d/0epwCQbN
200mm Shaft: https://a.co/d/07VNcaZV
60mm Shaft: https://a.co/d/06DHqOT2
M3 Inserts: https://a.co/d/06aa1T7I
C8 Socket: https://a.co/d/00LCbpYu
Slip Rings: https://a.co/d/0gjUztx1

Unless you have your own hardware on hand, here's some hardware assortments you can get
M2s: https://a.co/d/061zlhI9
M3s: https://a.co/d/09PhIY7o
M4s: https://a.co/d/0dV1pdmj

I printed with Elegoo/Deeplee Black PETG and a few pieces in PLA (They can be printed in PETG just fine), the rotor is printed in gray 3DHoJor PLA+, but you can chose whatever color you like.

Some notes for printing and lifting the siren;

The top projector and bottom intake horn are thin parts, this is intentional to decrease the weight load the bowl may put on the rest of the core, while printing make sure to use a very low amount of part cooling so that you don't accidentally warp any parts of the horn.

When slicing parts in your slicer, some parts may need to be reoriented to print correctly such parts include the frame, 6006 holder, chain cover, access panel, etc. It is up to you to be able to know what the most suitable print orientation is until I make an update for all the parts to have their print orientation pre-set

When lifting the siren you can use things like a leash or lanyard to lift by the 3d printing lifting eye which is accessible only when the motor cover is removed, alternatively you can lift the siren by putting two hands below the stand and lift upward

Motor Sourcing Information:

This siren has a 6 inch (152.4mm) diameter rotor, and too spin it you will need a DE31-00029 motor, there are a few variants that are "29"s but they are the wrong kind, so here is a list of motors that are known compatible models and or SMV types to look for. Side note; "OS" is ribbed face and "SS" is flat face.

Model Types:

DE31-00029H
DE31-00029K
DE31-00029G
DE31-00029J

SMV Types:

U460B(OS)
U460B(SS)
460UAL-1(OS)
U460B "YDK" - QUICK NOTE: This is a special version of the 29 to have true tapped M4-.7 end bells, it is still however the same fit as a usual 29, however the 3d printed eyebolt may not properly fit this motor variant