My caterpillars keep climbing to the top of the cup, does this mean that they are ready to attach to form their chrysalis?Updated 9 months ago

Your caterpillars will climb around exploring their cup, so may go up and down many times before they are ready to attach.

When they have moulted 4 times and have grown to around 10 times their original size, they will then be ready to attach from the lid and form their "j" shape.  This is normally around 7-10 days into the cycle, but can vary depending on the time of year and internal temperatures.