K2 Filament Clip: Drybox-Remix

A simple remix to the K2 Filament Clip that adds a 4mm hole through the center that is compatible with most common size PTFE tubes (reverse bowden).

Ideal for use in drybox where the PTFE tube feeds through into the box (for example my knurled-pc4-m6-ptfe-drybox-feeder), such that the clip can slide over the PTFE tubes and out of the way of the filament. When the time comes to take your spools out of the box, the clip is already positioned to clip the filament onto it. (This has saved me already from a few tangles when I accidentally pulled the filament too far out of the tube and lost the end!)

Also added another variation with slightly tighter grip on the filament when clipped in place to prevent slipping.