1. My miniatures are designed in 1/400 scale so can only be printed in "smooth/est detail" plastic.
2. 6mm is the common wargaming term for 1/285 scale.
3. Moving parts don't work easily because the wax support can't escape the joints. After 2 to 20 hours in a Simple Green/50 watt ultrasonic bath some parts will move. At these small scales the wax is stronger than the <1mm plastic pivots. So consider all models static with only a tiny chance to have moving parts unless noted otherwise.
4. You can request other scales, but bigger is exponentially more expensive. 1/400 to 1/100 is 4x larger in scale, but 4x4x4=68x larger in material), and might not even fit a printer's max dimensions. The "versatile" plastic looks like sandstone and is impossible to paint smooth on small models so I won't offer it in my listings unless specifically requested. A 5x5x3 inch cube is $2300 in the smoothest plastic so anything over 1/160 scale would need deep pockets.
I am quite busy doing real work, this place is just a hobby=loss of money. You can see some of my portfolio at facebook/ttakata73 (I don't use FB's messenger).
Most of the recent cars and trucks have taken me 8 to 10 hours to design. I charge $50 per hour to do design work so unless you are very enthusiastic or rich, please don't waste my time.
Example 1: TaxibotWB is a big vehicle that took 20 hours since no drawings or dimensions are publicly shared and is $26 in 1/200.
Example 2: LSR1931 Blubird4 is a small car that took 8 hours to design and is $35 in 1/87
Example3: GPUFT99 is a box trailer that took 2 hours to design since its simple extrusions and orthographic drawing/dimensions do exist online.
Please email any orthographic drawings to ttakata73@gmail if you want a quote. Any basic design needs to have a straight on front, side, and top views. If the bottom and back are different then those drawings must exist too. I essentially need to know what an object looks like flat from all sides so if you don't have this info I can't make it without a lot of guessing. You can find great videos online about "orthographic drawing" to explain how to design on paper. I don't do sculpted forms like modern cars, wings, animals, etc....because no info exists for body contours so they would be impossible to duplicate without a 3D scanner.