Davely Heavy Damper
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These are stiffer, heavier-duty damper backbones for the davely telescope mount.
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The original Davely is a telescope mount, a clever and novel design with inexpensive parts and a small form-factor that means it's readily printable on small print beds like the Prusa Mini+ or the Bambu A1 mini. It includes teflon tube dampers which are adequate for light duty and balanced loads like the hadley and are intended to be used with a stiffer filament like PLA or CF filaments.
Typically, I print in standard PETG, and I found that the original teflon dampers quickly bent themselves out of shape when I tried to use them with a rather imbalanced AT60ED telescope.
My goal was to make a stiffer damper for the more flexible engineering filaments. Telescope mounts live and die by the quality of their movement, and the teflon dampers of the davely are a direct translation of force to affect that movement. A stiffer damper results in several outcomes-
- A more even distribution of force across the teflon tube which has a rather direct impact on how smooth the movement feels
- Finer control over high tensions for imbalanced loads
- Fewer “hot spots” of tension, those often causing sticky and unsatisfying movement
These heavier duty backbones are nearly twice as thick, include some mindful use of perimeters, and thusly better maintain their shape compared to the original design. In my experience they work well and remain relatively stiff in PETG. They will fit over both the altitude and azimuth bearings with no modifications required except a slight reduction in the length of teflon tubing.
These are designed for PETG filament, but will only function better when used with a stiffer filament like a PLA or carbon fiber doped option.
Note that I have noticed a positive difference in the function of my Davely after these were installed, but all use-cases are different and the original bearings may work perfectly fine for you.
Print instructions:
Using a 0.6mm nozzle, use 4-5 perimeters, more perimeters are much more important than infill. Anywhere between 15-30% infill is fine. I used 0.15mm layers, but coarser layers are fine. With smaller nozzles, know that it's best if the perimeters of one section make contact with neighboring perimeters. Much of the design is strengthened by how much the perimeters of different sections intersect.