Prametric Monorail Tracks (no supports)

This one is optimized for 3D printing, with a single reusable support piece that is inserted about 5 minutes into the print for practically perfect bottom surfaces.

Requires additional attention:

• 1x printed PETG support. PETG does not stick to PLA, so it is vital you print this part in PETG.
  • Enable ironing for a nice bottom rail finish
  • Wait until the bed has cooled down. If you remove the thin support piece while the bed is still hot you can permanently bend the part.
  • Before you start the print, place the PETG support piece on the heated bed with the ironed top face down. Leave it there until you insert it, this improves how well the next layer sticks to the support piece and prevents unwanted additional thermal expansion mid print.
  • When you slice the main rail, look for the layer where it prints mid-air and add a pause. In Orca Slicer you can do that by right clicking on the layer slider on the right.
  • About 5 minutes into the print (depending on your printer) your printer will pause. Take the support piece and place it so that the next layer will be laid down on the ironed top face. The piece should slide in with little to no resistance and barely move at all.
  • In principle you can also just enable support instead of the reusable piece, but you won't get results even close to this.
• 8x 4274 technic pin with stud, because side studs print notoriously bad. This version comes with technic pin holes instead.

More info and source files on GitHub. Tracks can be customized to fit any spline, radius or shape.