Functional Rear Ventilation - Trx UDR - 8421

Operational cooling system for Traxxas UDR (8421).

• 👇read carefully

  With the functional cooling system, add a touch of realism to your Traxxas UDR. Fully functional with two 40x40 mm fans, this system will allow you to cool down part of your engine and central transmission.

  
  *Why have decorative parts when you can have functional ones !?
   

   

• 👇 Important points, tips, tricks, and materials 👇
   

  The model below was printed in PLA Tough+ and TPU 95A HF

  - PLA Tough+ offers better flex resistance and is also less breakable than Classic PLA.

  - TPU 95A HF was used to make the intake hose.

  - Each print plate has been renamed for better understanding and good categorization.

   

  ⚠️The print profile is based on an A1 mini and a PEI Textured Plate. Remember to redefine your printer and build plate.
  ⚠️If you use a Smooth PEI plate with TPU it is essential to use glue to avoid damaging your build plate and to remove prints more easily.

   

  You will need to equip yourself with

  
  - Cutter or cutting tools.

  - Drill and a 2.5mm metal drill bit.

  - Punch and scribe or marker.

  - kraftprotz PLA, ABS, PETG, TPU glue.

  - Bambu Lab liquid glue (for TPU).

  x6: M3 x 8mm.

  x8: Cable ties.

  x2: RC 40x40mm fan.
  x1: Futaba type Y extension cable.
   

     

  
  Plate - 1
  x1: Output grille / protection.
  
  Plate - 2
  x1: Radiator / Fan support.

  
  Plate - 3
  x1: Engine chimney.
  
  Plate - 4

  x1: Air hose (A).

  
  Plate - 5
  x1: Air hose (B).
  x1: Air hose (C).
  x2: Sleeve.
  ⚠️Bambu Lab liquid glue (for TPU) and a Smooth PEI plate.

   

• Full assembly manual: Available in PDF format in French - German - Spanish* - English.

  *with a small translation oversight
   

  THE MANUAL IN BRIEF 👇

  
  Chapter 1 : Chimney attachment.

  
  - Remove the X protection fixed with 4 screws and the pilots and part 8421.

  - Place the chimney as in photo 3 and use a point, fine marker or punch to mark the location of the holes then use a 2.5mm drill bit to make the 6 holes.

  - Use a 10mm drill bit or a router bit to make a rough opening and finish the edges of the opening with a cutter.
  - Secure the chimney with six M3x8mm screws

     

   

  Chapter 2 : Fan assembly for intake.
  ⚠️ For an exhaust assembly, skip chapter 2 and go directly to chapter 3.
   

  - Once the fans are attached to the radiator, pass the cables through the small slot provided for this purpose

  - Once aligned, apply slight pressure while tilting it to bring the chimneys into the cabin.

  - Attach the radiator to the cage using the original screws 2577 - 3x10 BCS (photo 3).

  ⚠️ Please pass the cables under the tubular cage.

     

   

  - Place your protective plate by sliding it diagonally, not from the top or bottom (photo 1).

  - Position it horizontally and slide it onto the fans and radiator (photo 2).

  - Finally, reinsert the 4 original screws - 3215 - that connected the radiator to the protective plate

     

   

  Chapter 3 : Fan assembly for exhaust.

  ⚠️ For an intake assembly, skip chapter 3 and go directly to chapter 2.

   

  - Once the fans are attached to the protective plate, pass the cables through the small slot provided for this purpose and close everything with the 4 screws - 3215.

     

   

  - Remove the two dummy shock reservoirs 8423 before installing the complete radiator (photo 1).

  - Place your radiator by sliding it diagonally, not from the top (photo 2) and position it horizontally with the chimneys under the tubular frame (photo 3).

  - Now, slide the top of the radiator onto the tubular frame (photos 3 and 4) while keeping the chimneys to rotate on the lower tubular frame (photo 5).

  - Once aligned, apply pressure while tilting it upwards (photos 5 and 6) to bring the chimneys into the cabin.

     

   

     

   

  Chapter 4 : Intake hose assembly.

   

  - Generously glue the U-shaped hose (B) without getting it everywhere, then slide the sleeves onto it.

  - Once the connecting sleeves are in place, make the external and internal joints.

     

  
  - Prepare your three intake hose parts and do a dry fit.

  - Take a paint-type marker (Posca) or adhesive tape to make marks before permanently attaching them.

  - Generously glue the inside of the U-shaped hose sleeves without getting it everywhere, then slide parts (C) and (A) of the radiator and engine hose into them. Use the previously traced marks for a guaranteed assembly.

  - Lock the 6 air ducts with cable ties.

     

  
  Chapter 5 : Cutting and assembly of the pilots (optional).

  
  - If you want to keep the cockpit. Cut the center of the pilot's position (photo 1) and the rear right (photo 2), this is to allow the intake hose to pass.
  - Once the pilots are well installed and secured, please place a small foam shim with adhesive to compensate for the missing screw and prevent them from rattling in their seat.

     
  
  ⚠️let the build plate cool down before removing the 3D parts⚠️

Short Presentation