MountOne | 100MM Astrograph STL Set.

The MountOne 100MM Astrograph STL Set.

The 100MM Astrographs is one of four astrographs designed to work with the MountOne GOTO Telescope Mount.

Front and centre, top, is a 100mm f/3.5 apochromatic C-Mount lens. The lens has manual iris and focus control rings on the exterior of the lens.

The 100MM Astrograph enables automatic focus control of the lens by way of a stepper motor, belt and printed focus ring. Taking advantage of OnStep's INDI Focus driver, we can remotely control and adjust the precise position of the 100mm's focal plane.

Twin 6811-2RS bearings (the same as used in the MountOne), support any tension on the belts that adjust the focus. This keeps any stresses off both the lens and the Raspberry Pi HQ Camera it attaches to.

The 100MM astrograph integrates the lens, focus system, HQ Camera, a Raspberry Pi 5 & accessories, power converter, and an optional GPS into a single unit.

Full details on the MountOne Blog Post.

The MountOne 100MM Astrograph STL Set includes basic STLs and calibration prints.

The 100MM Hardware Kit includes the following parts.

• 1 x 100mm f/3.5 C-Mount Apochromatic Lens.
• 1 x LDO 0.9° Stepper Motor & Cable.
• 1 x GPIO Highjacker.
• 2 x 6811-2RS Bearings.
• 1 x Gates 3GT 264T Loop-Belt.
• 1 x 20T 3GT Pulley.
• 28 x M5 20mm Screws for Plastic.
• 10 x M2.5 8mm Screws for Plastic.
• 4 x M3 8mm Countersunk Bolts.
• 4 x M2.5 15mm Standoffs.
• 4 x M2.5 4mm Socket Cap Screws.
• 5 x M2 6mm Socket Cap Screws.
• 1 x 1/4-20 3/8 UNC Bolt.

The Hardware Kit also includes the 100MM CAD Pack.

The 100MM CAD Pack contains all digital resources for the MountOne 100MM Astrograph.

• STEP Files, including the Main Assembly.
• STL Files, full sets with all calibration sizes.
• F3Z Fusion Files, the fully-editable Master Assembly.
• PDF Files, Bill-Of-Materials with Fixings & Printed Parts.
• 3MF Files, for Bambu Lab P2S & A1 Mini.

Complete documentation, including printing and assembly guides, is available online

MountOne Documentation.

Version History.

09/04/2026 | First Release.