Toy Bulldozer

Introduction

Hi Everyone,

This is a toy bulldozer I made that uses print-in-place tracks and mostly snap fits to assemble. It's a fun little print and will be a fun toy for any age.  Approximate size is 170mm long x 120mm wide x 110mm tall. 

This tracks are a version of my finger tracks made for up-scaling to 125%. 

The main body uses 4 colors, and is optimized to avoid unnecessary color changes. I believe it does 22 changes total (which is not bad imo).

If you want to cut down waste, you can forgo the red/orange tail lights and reflective sign on the back (just change them to the same yellow color as the main body. 

 I've also made a slightly different version that does not require the AMS, its located in separate print profiles.  

2025_04_01: I never got around to making a ripper for the back, but check out @BrezZZz's awesome design here.

If you like this, you should know that I've finished my Cyberbrick remote controlled version of a bulldozer. Its has a slightly more complicated assembly, but its pretty fun to play with. Check it out here!

Printing

• Use my print profile for settings and orientations of parts
• For filament, you will need a yellow, blank, silver or grey, and a red or orange for the features on the back. 
  • It was pretty hard to find a good yellow for this that matches a construction yellow color. I like Bambu's sunflower yellow which has a bit of an orange tint. 
• Everything is set at 125% scale in my print profile which is intentional.
  • If you want to print smaller at 100%, use my finger treads v2 rather than the ones in this file. 
• The treads can be difficult to print, but these are scaled up and a little more forgiving
  • If you have trouble printing:
    • clean your buildplate really well with soap and water
    • flow calibration can help 
    • Silk filaments (and some matte filaments) won't be as strong as normal

Assembly

Assembly following the general steps outlined here. Most fits are very secure snap fits. There are a few friction fits that should assembly just fine, but you should use a couple drops of glue to secure if small children will be playing with this. 

Assemble the main components as shown. Ensure the tracks run smoothly before assembling, as they will be difficult to remove once snapped in place The seat, cab roof, and air intake are all just friction fits. These you may want to assemble with glue.
2. Install the blade pivots into the rear axle of the track as shown.   Not the orientation - the curved surface on both should be facing forwards (this is also difficult to disassemble once snapped in place).
3.  Snap the blade frame over the pivots.
4. Install the blade travel stops into the front axle of the tracks.  Again, not the orientation of these, the flat ledge should be one the lower side.  You will have to rotate the blade frame upwards before inserting these.
5. Install the cylinders into the front of the frame.  The lower part of the cylinder will have to be rotated forwards a bit to fit into the frame. Then rotate it back to line up with the upper part. The best way to do this is to do the pin that goes through the main body last. You may also want to glue the connection between this pin and the cylinder at each end.
6. Insert the blade onto the frame.