RST Gila T5 Fork Preload Bolt Cap Replacement
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For Trek 4300
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Updated at source:
Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Attribution
This is a replacement for the screw-on caps for the fork that came with the Trek 4300 bike. If you attempted refurbishing the fork (as per this video: https://www.youtube.com/watch?v=d534ilYCaMk) and ended up damaging or destroying one of the caps trying to remove it (like myself), this model allows you to replace them. It features a 1" hex bolt head so you can use any standard socket set although I recommend screwing by hand. There are two components, the bolt and the preload tube, they are printed separately for better printing reliability. I simply glue them so they stick together. The upgraded models I have added a square peg so that the two parts can align better, but I haven't actually printed them. The preload tube, in theory, can be edited to longer or shorter depending on your needs, as the original part is in theory adjustable, but on a fork like this it probably doesn't matter, I made it to be close enough that the combined length is equivalent to the original in its default configuration.
My printing preferences:
Bolt: thinnest layer height possible (I printed using Creality's dynamic layer height option to speed up the base during development, but it's probably better to just print the entire thing at the thinnest setting, on my printer this is 0.08 mm), 30% infill, 8 wall loops, print with threads facing up, consider increasing thickness of bottom layer (bolt top) if it's too fragile or the texture is off
Tube: 0.2 mm layer height, 15% infill, 6 wall loops
I printed with PETG on a Creality Ender V3 SE.
Bolt generated using Blender's Bolt addon with the following settings:
Model BOLT; Bit Type NONE; Head HEX; Head height 15 mm; Flat Dist 25.3 mm; Side Count 6 mm; Shank Length 1 mm; Shank Diameter 28 mm; Thread Length 12 mm; Major Diameter 26.1 mm; Minor Diameter 25.1 mm; Pitch 1 mm; Root Shape Flat; Crest Percent 25%; Root Percent 30%; Div count 64
Note that although I've ridden on the bike without any issue, and in theory it should be plenty solid enough for the purpose, I don't want to make promises, so just please be careful and verify that everything is in order.
Please let me know if there are questions or concerns.