I have found long materials tend to not be as flat as proofgrade sheets, so I’ve been using hold-down pins but not pushed down all the way so that I can slide the material down during each step. They also act as guides for the edges of the material.
I decided, why not make a versions specific for this task, then realized they work just fine as regular hold-downs as well.
Passthrough pin.svg.zip (2.4 KB)
I use 4, one at each “corner” where the material enters and exits the bed. I angle them “inwards” so that the material is pulled down from them, not pushed against them. ( \ … / )
The little tab is 0.1" off the bed, because the materials I mostly work with are 0.08-0.15" thick. Anyone here could quickly adjust this to any height they need.