3D printed accessories for hassle-free astrophotography

Made in Germany - Shipped from Germany

Belt drive for the ZWO EAF on the Baader Diamond Steeltrack (BDS) Focuser

The provided adapter kit allows using the ZWO EAF attached to the popular Baader Diamond Steeltrack (BDS) focuser via a belt drive.

(use the arrows on the left and right sides in the middle of the frame to scroll through pictures)

Compared to other adapters and to the standard solutions from ZWO, this adapter is much more compact and provides a clutch mechanism allowing manual control of the focuser when needed, for example, for collimation. This adapter requires removing the coarse knob on the focuser, since it is replaced by a pulley (included in the package). Still compared to other adapters, the mounting of the adapter does not require a partial disassembling of the focuser which is risky and might violate the warranty.

There are two versions of this kit. One is for BDS-RT and another is for the the BDS-SC version of the focuser. The construction is the same, but the difference is sizes of the ring and belt due to difference sizes of the focuser tubes


  • All 3D-printed parts
  • Pulley replacing the coarse focuser knob
  • Pulley for the EAF
  • Timing belt in according length
  • 4x M3 20mm blots for mounting of the focuser
  • M3 25mm axis bolt
  • M4 12mm trimming thumb screw
  • M4 nut for trimming

If you have questions, feedback or suggestions for custom changes, please contact us using this form.

Available on backorder


VAT exempted according to UStG ยง19
Delivery Time: ca. 10 workdays
Additional costs (e.g. for customs or taxes) may occur when shipping to non-EU countries.

Available on backorder