Lowboy Trailer - 1:18th Scale Modded by SIHuze

I Printed on an elegoo century carbon 2

Printed with a 0.4 mm nozzle

Printed in

Elegoo PETG - CF / Main Bed, Gooseneck, Backend, Wheels, Test Block 

Elegoo TPU 95A / Tiers, Mudflaps

Elegoo Rapid PETG / Everything else

Hardware

6 2M x 6mm bolts to attach the mudflaps

2 2M x 20mm bolts to attach the rollers to the gooseneck

2 4M x 12mm bolts to attach the two halves of the main bead.  (Also used thick CA glue in the faces of the halves and on all sides of the tabs.  Installed the bolts to hold firmly together while CA glue cured for 24 hours.)  IF YOU GLUE THE HALVES TOGETHER DO NOT FORGET TO INSTALL THE RODS FIRST  

3 4M x 20mm bolts and nuts to attach the backend to the main bed.  4M x 16mm might also work for this but I didn’t have any to try when I assembled mine.  Can’t see them without flipping the trailer over and at that point you have bigger problems.

1 3M x 12mm bolt to go through the top of the gooseneck to attach the kingpin too. You may want to add a dab of thick CA glue around the top of the bolt to keep it from moving.  Mine has not yet but may need to in the future if I glue the wood slat down over it. 

20 Sets M3 x 12mm Screw & Bolt Assortment Sets,Binding Post Screws. Search for that on amazon and you will find them.  You need just 1 but that is how they are listed on amazon and they ship 20 at a time.  You should be able to hand screw one of these onto the the 3M x 12mm bolt from underneath.  Do not tighten all the way down.  I made it so it was adjustable to the thickness of the 5th wheel.  You may want to add a dab of blue thread locker to keep it from moving once adjusted.  I did not think of using these myself.  Found a random Reddit thread where someone recommended them.  Would love to give credit to them but can’t find the post again.  Just a heads up, not all of the diameters of the heads of these are the same.  I got lucky when I just grabbed one out of the bag and it worked.  I took the hardware off the trailer recently for painting and I found out when I grabbed another one out of the bag that it didn't fit quite right, it was quite a bit wider than the first one I used.   After digging through the bag I found there's several different diameters.   The smallest diameter worked for me.

5 PCS 6.35mm(1/4") Dia 12" Length 304 Stainless Steel Rods SS Metal Rods. Also found on amazon under that title.  3 are used in the body of the main bed to distribute the weight of the load throughout the bed instead of just at the joint.  1 was cut into 2 120mm or 4.73 in ish pieces for the axles.  I cut it with a angle grinder so I tapered the cut end after so there was no flare from the cut.  These rods measured 6.5 mm  diameter  down their length. So I created a block to test the fit which is included in the file.

Optional 6 inch wide rubber grip tape.  Added because the tank I made the trailer for has metal tracks and kept sliding off the trailer.  I did wrap it over the ramps on the main bed and it gives the trailer traction when loading the tank so it does not push the trailer around.  If you do this I suggest putting the wood slats in place first.  This supports the tape while cutting, making it much easier to trim.  Warning.  You may need to print new slats after.  When applying it to the back end I ran the tape long where the backend bolts the main bed.  I then put a wood slat in the main bed and held the razor in place against the wood slat.  Then I slid the back end past the razor several times to cut off the extra length of tape on the backend making the tape fit perfectly.  Do this without the wheels installed.

You may need to glue the tires to the wheels and the wheels to the axles.  I haven't had to but the tolerances on your 3D printer may very. 

There is a locking pin from the original print to lock the main bed to the gooseneck but the original model has the hole on the bottom to the gooseneck making it unusable.  I ment to fix this but forgot.   I just drilled it out using the original hole as a guid on my one of my early prints.  I found it unnecessary and did not print the locking pin or drill the hole out on my final version.
 

I've had a few people asked if the Terranaut fits on the trailer so I've included a couple pictures of that.  I also added my scx24 Little Guys Racing R Factor chassis build.  This has a longer than normal wheelbase and very wide.  Both just fit on there together without touching and can fit without the outriggers.