KK Show full post »
KK
Alright, so first attempt at fixing the issue of slippage is to print tires with tread instead of just being flat. Then also used the “wide wheels” on the rear...

Here’s wheels before and after:


Some nice tread on them:




Will post a video again when I go driving. The bearings are on a slow boat from china so until then using printed washer in place of bearings so differential some what works...
Quote 5 0
Wildthing
Quote:
Alright, so first attempt at fixing the issue of slippage is to print tires with tread instead of just being flat. Then also used the “wide wheels” on the rear...

Here’s wheels before and after:


Some nice tread on them:




Will post a video again when I go driving. The bearings are on a slow boat from china so until then using printed washer in place of bearings so differential some what works...

I was just at Michaels today saw some colored foam sheet of all colors , letter size and about 1/8" thick for about $1.00 . really flexible and very soft, just a though if the printed ones still don't work. The treads might help in dirt but on pavement I think it will be the same as before. Mind you I don't know how soft the filament is either.
Quote 2 0
TomMonton
I'm impressed. The car runs far better than I had expected.
Fly like your mad at it.
Quote 2 0
KK
Quote:
I was just at Michaels today saw some colored foam sheet of all colors , letter size and about 1/8" thick for about $1.00 . really flexible and very soft, just a though if the printed ones still don't work. The treads might help in dirt but on pavement I think it will be the same as before. Mind you I don't know how soft the filament is either.

I have a box of those sheets that I used a while ago as "vibration dampeners" when mounting motors.. Those sheets are very soft and will have holes in them sooner than later. The filament I used here has shore hardness of 90-95 (equivalent flexibility to a soft thin O-ring or a phone cord) so not the most flexible material... a shore hardness rating of 85 or even 74 filaments such as trueflex or ninjaflex would work best. However, the flexibility of any printed object depends on the amount of infill.
Its hard to see but you can see how easily I can squish this old tire which was printed with infill of 14% with 50% infill extrusion rate with 3 perimeters:

IMG_9054.JPG 


That said, this time around I have only done 2 perimeters and 10% infill with 40% infill extrusion rate which is way under-extruded! I even reduced my overall extrusion rate by a few so it is nice and even a bit softer now and I can even bend the treads... I am very hopeful on these. Will give them a try and will report back...
Quote 3 0
KK
Quote:
I'm impressed. The car runs far better than I had expected.

I am really happy with this project and its so cool that everything except for electronics and screws is 3d printed! Looks great and rides well too... Its a fun project and I highly recommend it
Quote 4 0
JettaManDan
how much to build me one?
My YouTube Channel - 250+ Video's! http://www.youtube.com/jettamandan09

I'm an R/C Junkie! 40+ planes - 12 Heli's - 6 multirotors - and ground vehicles galore! I've got issues.
Quote 3 0
KK
Quote:
how much to build me one?

. Thats a tough one to answer. I honestly don't know... Never really done a cost estimation for 3d printing things. But if you are really interested we can discuss this over email
Quote 1 0