18mm Soft Attach Block / Pulley

thingiverse

I started with Bedzplane's version but found myself needing to modify it a bit for my purposes. I'm using this on a catamaran to route the 3/16" (4.7mm) shock cord used for the trapeze system underneath the tramp. The original version had some hard edges so I rounded everything over a bit to keep chaffing to a minimum. I also sized it to use 3/16" stainless steel tubing for the axles. All of the parts push fit together and the becket then helps to hold it all together. I then run a small line through the back of the shell and becket which locks it all together. This has the effect of pulling the parts closer together as it is tightened, and the higher the load the tighter it is held, which makes it quite strong when printed at 50% infill or more. Single Block: Cut your stainless tubing to 10.4mm lengths and print the following: * Shell Top * Shell Bottom * Sheave * Becket Alternatively, I have a second option for the becket, which adds a spot to tie an additional line to. * Becket Alternate Double Block: Cut two sections of stainless tubing to 10.4mm lengths and print the following: * Shell Top - Qty 2 * Shell Bottom - Qty 2 * Sheave - Qty 2 * Becket_Double Edit: I have now uploaded files for a jig that will make it easier to accurately cut the stainless steel rod to size with a hacksaw. This works like a miter box that positions the tube to exactly 10.4mm in length. The secondary part can slip over the tubing on the far end and holds it level for when you are working with a longer length.