TT-02 Type S Rear Droop Brace

thingiverse

Going from a TC4 to a TT02 in order to get back into the hobby, I noticed my new TT02 Type S didn't have a means to adjust droop yet the holes for grub screws were there. I've printed this which, while it certainly has more flex than a carbon alternative, it's pretty marginal and I imagine the benefits of having adjustment outweigh the slight flex issues. The other advantage of this part is that it acts to retain the rear hinge pins without need of the bulky rear bumper. Requires 3x10mm grub screws which are widely available. I've also tried to countersink the bottom holes but some further countersinking with a drill bit may be suitable. As for strength and how well it holds up in racing - I've not yet been able to track test this (hopefully in 2 weeks) but will report back. It'd certainly be worth printing a couple of spares just in case and printing time is ~1 hr. Printed with PLA, 0.12 (just to make the tolerances tighter and unscientifically I suspect more finer layers may increase strength) and 80% infill using an Ender 3. I'm also working on a front version but this is not as easy to make in a stiff manner due to the way the layout prevents bulking the part up. Check my other designs often as I may eventually nail it. There are front versions from carbon although these require trimming of the bumper mount - I'm not a fan of that. EDIT - The part has held up fine to being raced without breakage. I suspect this is due to the metal brace being the main source of strength to the hinge pins. With regards to the droop screws though, I ordered some grub screws online (not official Tamiya parts but these are generic and fit fine). What I've found is the PLA has sagged under the constant pressure from the droop screws being used to adjust ride height - if you've decent threaded shocks this may not be as much of an issue, but with the mini CVAs I've needed to fine tune height via the droop screws. Two or three potential fixes to this: Use ABS will likely help. Changing the orientation of the part so the layer lines add strength (currently printing a part to confirm this). Use threaded shocks and rely on the droop screws to not be under compression/tension and instead control the 'drop' or droop of the arm as originally intended.