Is this 3D model free to download?

Yes, 125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) is free to download from Cults3D. Open it in the free Thinger app, or use the "Download from Cults3D" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Cults3D. Use the "Download from Cults3D" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by CBVBOGDAN, published on Cults3D. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) 3D printable model by CBVBOGDAN

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) photo 1

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) photo 2

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) photo 3

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) photo 4

125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension)

Source: Cults3D by CBVBOGDAN

The 125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) is a free printable 3D model from Cults3D by CBVBOGDAN. 3D-printed 125:1 reduction gearbox to motorise the altitude and azimuth axes of a Dobsonian telescope. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Cults3D

30 saves Source: Cults3D Updated 2026-10-27 License: CC-BY-NC · non-commercial Category: Decor & Art

Tags: gearbox, htd 3m, belt reduction, nema 17, telescope, dobsonian, sky-watcher, astronomy, 125:1, cadquery

About this model

3D-printed 125:1 reduction gearbox to motorise the altitude and azimuth axes of a Dobsonian telescope. project here: Three identical belt stages (HTD 3M, 80T/16T pulleys, 5:1 each) are arranged in an equilateral triangle. All three stages share the same centre distance, so the same 288 mm belt is used everywhere, and the output shaft ends up coaxial with the motor shaft, one level higher. KEY FIGURES - Reduction: 5 x 5 x 5 = 125:1 - Pulleys: 3 x HTD 3M 80T + 3 x HTD 3M 16T, 10 mm wide - Belts: 3 x HTD 3M 288 mm (96 teeth), 10 mm wide - Centre distance: 64.79 mm - Footprint: 166.8 x 158.1 mm; height 110 mm (158 mm with mounting flanges) - Motor: NEMA 17 (42.3 x 42.3 x 40 mm), 5 mm shaft - Output: 8 mm shaft, 20 mm protruding - 400,000 micro-steps per output turn at 1/16 (about 3.2 arcsec pe…

Frequently asked questions

Is this 3D model free to download?: Yes. 125:1 triple-belt gearbox for Dobsonian drives (HTD 3M 80T/16T, NEMA 17, adjustable belt tension) is free to download from Cults3D. Open it in the free Thinger app, or use the "Download from Cults3D" link above to open the original listing.
Where is the STL hosted?: The download is hosted by Cults3D, not by Thinger. We link you directly to the original listing by CBVBOGDAN.
Who made this model?: Designed by CBVBOGDAN, published on Cults3D. Please credit the creator when sharing your print online.
Can I print this at home?: Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.