Each player takes 3-4 “extrusions” (a nozzle and spool connected with “filament”) at random. You can use a bag if you like, or mix them up and have only the nozzles protruding from something.

The bar is placed in the top-most position.

The point of the game is to Z calibrate by visual inspection only. There is to be no measurement of extrusions using any objects. Exercise a degree of fair play as it suits the situation.

Players may not approach the “printer” whilst they are selecting which extrusion to play. Adjust to the situation, but a one-meter rule is suggested. Put some tape on the floor if people need help adhering.

Play

The first round starts with the oldest player and proceeds clockwise. The winner is the player with no remaining extrusions at the end of any round (not upon playing their final extrusion).

Each player hangs one extrusion on the frame with the goal of getting as close to the print bed as possible without causing a collision (touching). Spools must be seated correctly within their slots.

You choose your extrusion at your turn, so you can factor in how players before you have played.

Once all extrusions have been placed:

- Any player that has collided with the print bed is out of the game! It proceeds fast, so you can try again soon.
- The furthest player from the print bed takes all of extrusions, moves the bar to a different position and makes the first play of the next round.

Advanced play

There is sufficient play to place the bar at an angle where one side is up to three holes removed from the other. Players are free to use any open slot for each round.

Printing

I used 0.2mm layers for everything. Nothing needs supports and I added brims only to the nozzles.

I printed the bed with a colour change to get a nice “build plate” look. This could easily be printed in one colour also.

I recommend printing 3-4 extrusions per person; there are four of each in each file.

Assembly

Glue the two halves of each spool together. I have sized them to adhere well.

Attach spools to nozzles with cordage of your choice. I used cheap embroidery thread. Both the nozzles and the spools have a thinner end so that you can tie a knot and have it catch (like toggles for blinds).

Each “extrusion” in the game set must be of a different length, or a draw is possible and if those players continue head-to-head you can get in a stalemate loop. You may make up new rules to work around this, I just wanted to keep it reasonably simple.