Filadelphia is a standalone filament holder that prints in one piece without any supports on a Makerbot Replicator 2 with PLA.
Everything is modeled under angle so the wheels axes spin and stay in place without any assembly or additional parts or screws : Just print 4 of them, fold out the stands & click them together.
As proof of concept here's a timelapse of printing 8 Filadelphias (8 hours) ... fed by earlier printed Filadelphias :
Here you can see how multiple Filadelphias can interconnect in order to put multiple rails next to each other :
Filadelphia was created from scratch in Blender and printed in PLA with Makerbot Desktop Beta 188.8.131.52. I found that printing in standard (0.2mm) resolution gave the best results. It takes about 1 hour to print one object and I can print 8 at once.
Here's how it comes off the raft and folds open :
As you can see the wheels spin perfectly (and actually a lot better than I ever expected :) ).
Although it stands perfectly on it's own I provided a screw hole for those that want to fix it in a more permanent way. With the pads folded in you can mount two rails closely together and save space.
The pieces may feel be a bit hard to click together but we want them secured and that didn't work perfectly with earlier (more lose) tests.
I've added a 'connector' (removed the wheel & holder) to fit in between two rails and a double version as well.