Some build pics of my son’s OpenRC Truggy. So far so good. Progress was halted waiting on delivery of the 2mmx32mm pins for the lower control arms.
Also a quick question for the more experienced OpenRC builders out there. I think the CV joints on the axles I bought are wrong? In the pics you can see the end of the shafts extend too far through the hub? The overall length of the shafts are correct, but the stub? is too long?
Looks great so far! What printer do you have? I think the surface finish looks Top Notch!
Thanks for the update!
@Daniel_Noree These parts were printed on a heavily modified Velleman K8200. It was my first printer and I still use it to this day for all my high quality prints. I also have a XL Ultimaker clone I built from scratch that prints much faster, with a much larger build volume, but I prefer the Velleman for high quality prints.
in response to your shaft question, there should be a bearing on the inside and one on the outside. Looks like there are two on the outside.
@Nick_Pagazani Sorry. Should have added that the extra bearing on the outside was installed to try and take up the slop? in the stub. The hub is assembled correctly with a bearing on the inside and the outside. The stub is simply too long. I have seen pics of the same part number with a different style stub. The one I have is longer with a ‘flat’ machined on one side. The one that I think we need is shorter, with a hole drilled through. I’m looking into sourcing just the CV joint/stub separately.
Here is a link to the type that I should have ordered. Notice they are shorter overall, with a hole drilled through. Both parts are listed as 188015, but for some reason they can have either type of stub.
Didn’t realise until the we started assembly. At least the parts are cheap enough to not be a big issue.
those 188015 are too short in the axles, there isnt enough length to go through 2 bearings and the hub. I was sent 108015 by mistake and theyre the same with a different joint.
@Nigel_Nichols I printed the modified control arms and steering links ect to suit the all metal drive line. So far the length seems good. My son has not completed this whole assembly yet though, so thanks for heads up.
@Justin_Morel yeah, I’ve heard normal 188015 shafts are fine but the ones pictured in that link seem odd. I’m waiting on mine to find out
@Justin_Morel by the way, you can get extended hex adaptors. Unfortunately it seems that the 188015 drive shafts have a flat rather than hole for a hex adapter. That means most hex adaptors won’t fit. There is somewhere on thingiverse a printable adaptor.
Right, so I can confirm that 188015 shafts DON’T FIT a standard build truggy. They’re slightly (1-2mm) too long and bind up in the differential. However, with a slight modification to the differential output shafts, they fit a REAL treat.
I’ve uploaded the files I’ve modified for use on thingiverse and will continue to upload files I modify. This is a great car but with lots of little issues so I’m rectifying them as I build.
@Nigel_Nichols nice work on the modified parts. I’m still having issues getting a full metal driveline working properly.
I’ve tried the modified diff housings designed to fit the metal diffs, but they need some tweaks (clearance and backlash adjustment mainly)
When I have time I’ll upload the files into inventor and play around. The problem is time, or lack there of.
@Justin_Morel What steering setup are you using? It seems different than the stock setup. I’m building an all metal drivetrain as well and having spacing issues with the front differential casing hitting the stock steering arms. Also where did you get the hub adapters for the “D” shaped rods? I found the printed ones, but would rather a metal set. thanks!
Stock steering set up (I think, its been a while since I printed the parts) FYI, I had the same clearance issues, I just did a quick and dirty dremel mod of the front diff assembly to clearance it.
There is a small problem with the geometery of the steering (excessive toe) so I will need to investigate further and reprint some parts down the line.
Some updated pics of the (almost) complete Truggy. And the happy little test driver to be 
Thanks good stuff! I need to get back to the project. I’m about 99% completed. Had some setbacks with the axles a couple months. Need to get re-motivated.
