A model ski lift which requires a relatively small number of additional, non-3D printed parts, and has the facility to be motorised. It suits lego characters and I've incorporated some parts from Thingiverse.
All the parts can be printed without support. The pylons are printed upside down to facilitate this.

Video:
https://youtu.be/MlcBdFs7ffU?si=gr6_IR_OHwXk3Kqn

Video of double pulley wheel set up:
https://youtu.be/cZof82rp6sE?si=cHPt1ZfEN6MEuvxz

Thingiverse parts:

Ski

https://www.thingiverse.com/thing:2813235

Motor Mount (Scaled to 104% for my printer)

https://www.thingiverse.com/thing:3669681

N20 Motor to Lego Adapter (Scaled to 110% for my printer)

https://www.thingiverse.com/thing:3824381

Trees

https://www.thingiverse.com/thing:1216450

Other Parts, etc.:

2mm dia steel axles

https://www.amazon.co.uk/dp/B014GMQ5HY?psc=1&ref=ppx_yo2ov_dt_b_product_details

2mm dia bungee cord

https://www.amazon.co.uk/dp/B07SK2XHG1?ref=ppx_yo2ov_dt_b_product_details&th=1

N20 Motor

https://www.amazon.co.uk/dp/B01ES98QSG?psc=1&ref=ppx_yo2ov_dt_b_product_details

Snow effect blanket

https://www.hobbycraft.co.uk/snow-blanket-80cm-x-1m/6654671000.html

Some lego technic bits such as axles etc.
Superglue to fasten the pylons to their wooden bases and the pylon guides to the pylons, as well as for bonding the ends of the 2mm bungee.

If anyone knows a better way of making a smooth join in the bungee please let me know in the comments. I've just used a bit of cotton and superglue, but I'd like to improve it.

You'll need to mount the pylons on a suitable base with space to fit your motor if you're using one. You can then add your ski slope using foam/card/papier maché etc., finished with a snow blanket.

Have fun!

10/11/23 Update
Pylon Guide diameter increased slightly to reduce risk of chairs fouling against the pylons.
I've successfully superglued the ends of the bungee without using cotton. I used blue-tack to hold it in place until the glue dried and then trimmed off any excess with a craft knife.

23/11/23 Update
I've added a small part that makes it possible to use double pulley wheels which make the lift operate a bit more smoothly, although there will, inevitably, still be some jerkiness. The bungee joint is still OK.

18/3/24 Update
Correct version of pylon with attachment arms uploaded.