Dropper (Portal 2)
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A dropper is a puzzle element in Portal 2. Things like gel and cubes fall out of it. It can be hooked up to a button.
Creating Droppers
1. Create a func_instance entity with the following properties:
Property Name Value Fix up Name box_dropper VMF Filename instances/gameplay/cube_dropper_normal.vmf
If the cube dropper doesn't show up then save and reload so you can position it properly.
2. Create the entity you want to activate the cube dropper. For example, a trigger_once at the entrance to the room, and give it the following outputs:
My Output Target Entity Target Input Parameter Delay Only Once 
OnTrigger box_dropper instance:@cube_dropper;Trigger 0.00 No OnTrigger box_dropper instance:@cube_dropper_autorespawn;Enable 0.00 No
3. Hammer may indicate that these are invalid. Ignore it.
There are different instances for each cube type, and several different designs. Just substitute the kind you need for the VMF Filename parameter above.
Item, parameters Dropper style VMF Filename prop_weighted_cube, Standard Small, modern instances/gameplay/cube_dropper_dropontrigger_normal.vmf prop_weighted_cube, Standard Small, modern instances/gameplay/cube_dropper_multiple_normal.vmf prop_weighted_cube, Standard Long, exposed tube instances/gameplay/cube_dropper_large.vmf prop_weighted_cube, Standard Long exposed tube, dirty instances/gameplay/cube_dropper_large_dirty.vmf prop_weighted_cube, Reflector Small, modern instances/gameplay/reflectocube_dropper_dropontrigger_normal.vmf prop_weighted_cube, Reflector Small, modern instances/gameplay/reflectocube_dropper_multiple_normal.vmf prop_weighted_cube, Reflector Long, exposed tube instances/gameplay/reflectocube_dropper_large.vmf prop_weighted_cube, Reflector Long exposed tube, dirty instances/gameplay/reflectocube_dropper_large_dirty.vmf prop_weighted_cube, Sphere Small, modern instances/gameplay/sphere_dropper_dropontrigger_normal.vmf prop_weighted_cube, Sphere Small, modern instances/gameplay/sphere_dropper_multiple_normal.vmf prop_weighted_cube, Sphere Long, exposed tube instances/gameplay/sphere_dropper_large.vmf prop_weighted_cube, Sphere Long exposed tube, dirty instances/gameplay/sphere_dropper_large_dirty.vmf prop_weighted_cube, $item_type, $cube_type, $rusted, $paint_power, $use_new_skin_method Small, modern instances/gameplay/item_dropper.vmf Gel, Water Small, modern instances/gameplay/paint_dropper_erase.vmf Gel, Bounce Small, modern instances/gameplay/paint_dropper_bounce.vmf Gel, Speed Small, modern instances/gameplay/paint_dropper_speed.vmf Gel, $paint_type Small, modern instances/gameplay/paint_dropper.vmf prop_monster_box, walking Normal with music instances/gameplay/cube_dropper_a4.vmf prop_monster_box, hiding Normal with music instances/gameplay/cube_dropper_a4_box.vmf prop_monster_box, walking Normal with no tube instances/gameplay/cube_dropper_monster.vmf prop_monster_box, hiding Normal with no tube instances/gameplay/cube_dropper_monster_box.vmf Only what you put in Big box with opening instances/gameplay/cube_dropper_pendleton.vmf prop_weighted_cube, $paint_type, Wet Small, modern instances/gameplay/paint_bomb_dropper_modern.vmf prop_weighted_cube, Bounce, Dry Small, bare tube instances/gameplay/paint_bomb_dropper_bounce.vmf prop_weighted_cube, Speed, Dry Small, bare tube instances/gameplay/paint_bomb_dropper_speed.vmf prop_paint_bomb, $paint_type, $bomb_type Portal 1 Style instances/gameplay/paint_bomb_dropper.vmf prop_paint_bomb, $paint_type, $bomb_type Dirty instances/gameplay/paint_bomb_dropper_auto.vmf People, alive Big box with opening instances/gameplay/cube_dropper_player.vmf