This model holds 2 USB-C extension cables and exposes them on the top surface of the table, using the gap in the middle to gain access.

NOTE: These models assume a gap width of 5.5mm between the table sections. This is slightly larger than the actual gap width, so you will need to sand down the surface to make them fit snugly in your table. This extra friction helps to secure the model when someone inevitably tugs on a cable accidentally.

USB-C Extension Cables

The extension cables used in the pictures are these. The female end has a metal shroud that needs to be cut off. It doesn't fit in the table gap otherwise. Use a Dremel to cut the metal shroud off. After cutting off the metal shroud, the remaining plastic rim along both flat edges of the connector will also need to be trimmed, so it can fit in the gap of the table.

EXTREMELY IMPORTANT: Hold the metal shroud in your fingers while cutting, so you can monitor the temperature of the metal. Don't let the plastic melt under the shroud, as you cut it. It gets very hot, very fast, while cutting! You'll need to cut for about 0.5 secs. and then wait 5 secs. for it to cool down. Don't let the metal get too hot or it will deform the underlying plastic!

Preparing the Plastic Parts

Sand down the sides of the holder (table_usb-c_port_x2_holder.stl) until it fits snugly into the gap in the table. Do this before gluing the USB-C extension cables into the holder. 

You don't strictly need to glue the extension cables into the holder, but I recommend it. I didn't glue them together until the 3rd time I broke the holder, accidentally walking away while carrying a currently charging device. Since the gluing, no issues! 😅 I recommend gluing!

table_usb-c_shroud.stl should be printed with support material. You will also need to cut off the stability tab on this model, and then sand the top surface to make it look consistent. Alternate the direction of sanding strokes randomly for best results.

BOM

• Power Supply: mophie speedport 120 4-port GaN wall charger (120W)
• USB-C Extensions: USB C Extension Cable 0.2 m, Type C 3.1 Gen2 10 Gbps Female to Male Adapter
• Screws: 3.0mm x 15mm TX10
• My Table: SKOGSTA
• Super Glue

Other Advice

When positioning the Charger on the underside of the table, consider what would happen when someone spills liquid on the table surface. Basically, don't put the charger in the gap, put it to the side.