After repeated trial shooting, stars sometimes blur at 60 sec exposure with auto guide. 30 sec or less, stars are stable and appear as dots. Consistently good results are obtained with live stacking of 30 seconds or less. Upload photos of the Orion Nebula and the Horsehead Nebula.

UPDATED: 12 NOV 2022
I have redesigned circular gears and center shafts for more accuracy.

CircularGear0.6E_1.stl
CircularGear0.6E_2..stl
Shafts0.6E.stl

The first model used 25mm NEMA 17 on the DEC axis, but was modified to also use 35mm. This increases the power and thus the accuracy.

And an adapter has been added to allow the electric drill to rotate drive at high speed for break in.

UPDATED: 27 SEP 2022
The OnStep circuit will be changed to Wemos&CNC3. The material is easily obtained and easy to assemble. The back cover will be modified accordingly.
 

DEC_Housing_Back1_PCBSupport.stl >>> DEC_CircuitHolder.stl
DEC_Housing_Back2.stl >>> DEC_CircuitCover.stl
DEC_Housing_Back3.stl >>> DEC_MotorCover.stl

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How to assemble OnStep Wemos&CNC3

Uploaded DEC_Arca_Arigata_Plate.stl

UPDATED: 15 SEP 2022
Uploaded 1 file that I had forgotten to upload. DEC_Housing_Back1_PCBSupport

UPDATED: 24 JUN 2022
Updated assemble instruction for 3D printed parts
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[https://mr-deep-addicted.com/?page_id=1300](https://mr-deep-addicted.com/?page_id=1300)

Full 3D Printed Equatorial Mount.
RA: 1:180  DEC: 1:45
With Microsteps 1/16 RA: 1:1600  DEC: 1:400

The heart of this equatorial mount is the cycloid drive.

Click here for an instruction...
[https://mr-deep-addicted.com/?page_id=1300](https://mr-deep-addicted.com/?page_id=1300)

The above site is written in Japanese, but has a translation function.