Forest Marble Run - Swinging Bridge & 360˚ Detail

This model is compatible with the Maker’s Beginner Kit (B-ZC002). The kit includes various non-printed parts to support multiple designs, so some components may not be necessary for this specific model. This project uses:

• BT3x8 SHCS Self Tapping Screws
• 1.4x20mm Basic Rubber Bands
• 0.6mm Black Nylon Cord
• LED Flame Tea Light Candle Set- Warm White
• 8mm Stainless Steel Balls

Remove the supports from the base & place one of the 1.4x20mm rubber bands over the hook in the Band Holder and screw it into the base using one 3x8 screw.

• You may need to put some tension on the band that it can fit in the channel.
• The screw doesn't have to be too tight but should not cause the base to wobble.
• I found that 1 band was enough & that two applied too much force but you can experiment to see which works better for you.

Assemble the bridge by threading the Nylon Cord through the sides of the base and each side of the bridge pieces to create a loop.

• If you're having trouble threading the cord, try trimming off a small portion letting a small drop of superglue dry on the end to make it stiff.
• You'll want to have this fairly tight while still allowing the bridge to 'dip' a bit in the middle.
• Before tying a strong knot in the cord, test a marble to see if it rolls freely across the bridge.
• Tie off the ends on the exterior of the base so that you have more room to work. Underneath the arch (where noted in the photo) makes a good place.

Sometimes the holes for the cord can get slightly plugged where the contacted the build plate. When this happens, you can use a small screwdriver bit or other too to slightly enlarge the opening.